| @@ -185,9 +185,9 @@ | ||
| 185 | 185 | // so carry it — and everything else the late filter set in the |
| 186 | 186 | // same pass — over. A consumer reading the rendered HTML (or |
| 187 | 187 | // our own buffer passes) must still see the opt-out it asked |
| 188 | 188 | // for. |
| 189 | - $tag = self::copy_late_attributes( $tag, $pristine ); | |
| 189 | + $tag = self::copy_late_attributes( $tag, $pristine, $handle ); | |
| 190 | 190 | } |
| 191 | 191 | // The snapshot was taken on `script_loader_tag`, by which point |
| 192 | 192 | // `script_loader_src` (priority 10) had ALREADY swapped in the |
| 193 | 193 | // hashed cache URL — so reverting the tag alone still leaves the |
| @@ -230,9 +230,9 @@ | ||
| 230 | 230 | * |
| 231 | 231 | * @param string $from Tag as the late filter left it. |
| 232 | 232 | * @param string $to Snapshot tag to stamp onto. |
| 233 | 233 | */ |
| 234 | - private static function copy_late_attributes( string $from, string $to ): string { | |
| 234 | + private static function copy_late_attributes( string $from, string $to, string $handle ): string { | |
| 235 | 235 | $late_tags = self::open_tags( $from ); |
| 236 | 236 | $to_tags = self::open_tags( $to ); |
| 237 | 237 | if ( empty( $late_tags ) || empty( $to_tags ) || count( $late_tags ) !== count( $to_tags ) ) { |
| 238 | 238 | // Counts differ when a stamper/blocker injected or replaced a |
| @@ -254,9 +254,9 @@ | ||
| 254 | 254 | // later. (#469) |
| 255 | 255 | $out = $to; |
| 256 | 256 | // Right to left: an earlier splice would shift every later offset. |
| 257 | 257 | for ( $i = count( $to_tags ) - 1; $i >= 0; $i-- ) { |
| 258 | - $add = self::late_attribute_delta( $late_tags[ $i ]['attrs'], $to_tags[ $i ]['attrs'] ); | |
| 258 | + $add = self::late_attribute_delta( $late_tags[ $i ]['attrs'], $to_tags[ $i ]['attrs'], $handle ); | |
| 259 | 259 | if ( '' !== $add ) { |
| 260 | 260 | $out = substr_replace( $out, $add, $to_tags[ $i ]['attrs_end'], 0 ); |
| 261 | 261 | } |
| 262 | 262 | } |
| @@ -305,14 +305,25 @@ | ||
| 305 | 305 | } |
| 306 | 306 | |
| 307 | 307 | /** |
| 308 | 308 | * The attributes present on the late tag but not the snapshot, minus |
| 309 | - * the ones our own transforms add. | |
| 309 | + * the ones OUR transforms put there for this handle. | |
| 310 | 310 | * |
| 311 | + * Only attributes recorded in $our_late_attrs are dropped — a blanket | |
| 312 | + * defer/type skip threw away a defer the STAMPER set in the same pass | |
| 313 | + * as its marker. Themify prints main.js with defer + data-no-optimize | |
| 314 | + * together, and its config rides a deferred data: URI script printed | |
| 315 | + * just before it; stripping the theme's defer made main.js | |
| 316 | + * parser-blocking, so it ran ahead of its config and the theme died | |
| 317 | + * with "themify_vars is not defined". `src` is still never copied: | |
| 318 | + * it belongs to the snapshot, and restore_marked_script_src() owns | |
| 319 | + * undoing a minified URL. | |
| 320 | + * | |
| 311 | 321 | * @param string $late_attrs Attribute string from the transformed tag. |
| 312 | 322 | * @param string $to_attrs Attribute string from the snapshot tag. |
| 323 | + * @param string $handle Script handle the tags belong to. | |
| 313 | 324 | */ |
| 314 | - private static function late_attribute_delta( string $late_attrs, string $to_attrs ): string { | |
| 325 | + private static function late_attribute_delta( string $late_attrs, string $to_attrs, string $handle ): string { | |
| 315 | 326 | $pattern = '#\s([-\w:]+)(?:\s*=\s*(?:"[^"]*"|\'[^\']*\'|[^\s>]*))?#'; |
| 316 | 327 | if ( ! preg_match_all( $pattern, $late_attrs, $late, PREG_SET_ORDER ) ) { |
| 317 | 328 | return ''; |
| 318 | 329 | } |
| @@ -324,9 +335,9 @@ | ||
| 324 | 335 | } |
| 325 | 336 | $add = ''; |
| 326 | 337 | foreach ( $late as $attr ) { |
| 327 | 338 | $name = strtolower( $attr[1] ); |
| 328 | - if ( isset( $have[ $name ] ) || in_array( $name, self::OUR_TRANSFORM_ATTRS, true ) ) { | |
| 339 | + if ( isset( $have[ $name ] ) || 'src' === $name || isset( self::$our_late_attrs[ $handle ][ $name ] ) ) { | |
| 329 | 340 | continue; |
| 330 | 341 | } |
| 331 | 342 | if ( 0 === strpos( $name, 'data-xs-' ) ) { |
| 332 | 343 | continue; |
| @@ -336,21 +347,20 @@ | ||
| 336 | 347 | return $add; |
| 337 | 348 | } |
| 338 | 349 | |
| 339 | 350 | /** |
| 340 | - * Attributes our own transforms add. Copying any of these from the | |
| 341 | - * transformed tag back onto the snapshot would re-apply the very | |
| 342 | - * transform we are undoing: | |
| 351 | + * Attribute names OUR transforms added in this request, keyed by | |
| 352 | + * handle: defer_script_tag() records `defer`, delay_script_tag() | |
| 353 | + * records `type` when it parks an inline block. Copying one of these | |
| 354 | + * from the late tag back onto the snapshot would re-apply the very | |
| 355 | + * transform the revert is undoing — but the same names coming from a | |
| 356 | + * STAMPER are the author's intent and must survive, so the skip is | |
| 357 | + * per-handle, never by name alone. `data-xs-*` is handled by prefix | |
| 358 | + * separately. (#469) | |
| 343 | 359 | * |
| 344 | - * defer/async — defer_script_tag() | |
| 345 | - * type — delay_script_tag() parks an inline block as | |
| 346 | - * text/xspeed-delayed; a type the author set is on the | |
| 347 | - * snapshot already and matches by name before we get here | |
| 348 | - * src — belongs to the snapshot, never to the late tag | |
| 349 | - * | |
| 350 | - * `data-xs-*` is handled by prefix separately. (#469) | |
| 360 | + * @var array<string,array<string,true>> | |
| 351 | 361 | */ |
| 352 | - private const OUR_TRANSFORM_ATTRS = array( 'defer', 'async', 'type', 'src' ); | |
| 362 | + private static $our_late_attrs = array(); | |
| 353 | 363 | |
| 354 | 364 | /** |
| 355 | 365 | * Locate the opening `<script>` that carries the src, falling back to |
| 356 | 366 | * the last one when none does. |
| @@ -548,9 +558,15 @@ | ||
| 548 | 558 | // dependent that touches a global its dependency defines. (#234) |
| 549 | 559 | // |
| 550 | 560 | // The lookahead scans only within the tag (`[^>]*`) for ` src=`, so |
| 551 | 561 | // an inline `<script id="…-js-before">` can never match. |
| 552 | - return (string) preg_replace( '#<script\b(?=[^>]*\ssrc\s*=)#i', '<script defer="defer"', $tag, 1 ); | |
| 562 | + $deferred = (string) preg_replace( '#<script\b(?=[^>]*\ssrc\s*=)#i', '<script defer="defer"', $tag, 1 ); | |
| 563 | + if ( $deferred !== $tag ) { | |
| 564 | + // Remember that THIS defer is ours, so the late opt-out revert | |
| 565 | + // drops it — and only it, never a stamper's own defer. | |
| 566 | + self::$our_late_attrs[ (string) $handle ]['defer'] = true; | |
| 567 | + } | |
| 568 | + return $deferred; | |
| 553 | 569 | } |
| 554 | 570 | |
| 555 | 571 | /** |
| 556 | 572 | * Filter: `script_loader_tag` — rewrite src= to data-xs-src= so the |
| @@ -592,9 +608,16 @@ | ||
| 592 | 608 | // the moment jquery-core is delayed. A handle the user NAMED in |
| 593 | 609 | // delay_js_targets is still delayed — an explicit entry is the user |
| 594 | 610 | // saying they know the inline consumer is safe to break or absent. |
| 595 | 611 | if ( isset( self::inline_bound_handles()[ (string) $handle ] ) |
| 596 | - && ! self::is_user_named_target( (string) $handle, (string) $src ) ) { | |
| 612 | + && ! self::is_user_named_target( (string) $handle, (string) $src ) | |
| 613 | + // Smart Delay inverts this protection: the handle is delayed and | |
| 614 | + // its own before/after snippets are parked WITH it (see | |
| 615 | + // park_smart_inline()), so the consumer no longer runs against a | |
| 616 | + // missing global — it replays after its provider, in page order. | |
| 617 | + // On a builder page nearly every script is inline-bound, which is | |
| 618 | + // why delay-all without this delayed almost nothing. | |
| 619 | + && ! self::smart_delay_enabled() ) { | |
| 597 | 620 | return $tag; |
| 598 | 621 | } |
| 599 | 622 | // A non-executable type means this tag is data, or is being held by |
| 600 | 623 | // somebody else on purpose. The buffer pass has always checked this; |
| @@ -637,9 +660,9 @@ | ||
| 637 | 660 | // would win over a marker appended behind it and keep executing. |
| 638 | 661 | // A non-default original type is stashed in data-xs-type so the |
| 639 | 662 | // bootstrap can restore it on replay (#274 — type is what a script |
| 640 | 663 | // IS; a parked `type="module"` must come back as a module). |
| 641 | - $tag = (string) preg_replace_callback( | |
| 664 | + $parked = (string) preg_replace_callback( | |
| 642 | 665 | '#<script\b([^>]*)>#i', |
| 643 | 666 | static function ( array $m ): string { |
| 644 | 667 | return '<script' . self::park_type_attrs( $m[1] ) . '>'; |
| 645 | 668 | }, |
| @@ -645,9 +668,14 @@ | ||
| 645 | 668 | }, |
| 646 | 669 | $tag, |
| 647 | 670 | 1 |
| 648 | 671 | ); |
| 649 | - return $tag; | |
| 672 | + if ( $parked !== $tag ) { | |
| 673 | + // The parked type is ours to drop on a late opt-out revert; an | |
| 674 | + // author-set type sits on the snapshot and survives regardless. | |
| 675 | + self::$our_late_attrs[ (string) $handle ]['type'] = true; | |
| 676 | + } | |
| 677 | + return $parked; | |
| 650 | 678 | } |
| 651 | 679 | |
| 652 | 680 | /** |
| 653 | 681 | * Script types the buffer pass must never touch. `<script>` carries |
| @@ -1029,11 +1057,13 @@ | ||
| 1029 | 1057 | if ( empty( $opts['delay_js'] ) ) { |
| 1030 | 1058 | return $html; |
| 1031 | 1059 | } |
| 1032 | 1060 | |
| 1061 | + $handle_delayed = self::handle_delay_outcomes( $html ); | |
| 1062 | + | |
| 1033 | 1063 | $out = preg_replace_callback( |
| 1034 | 1064 | '#<script\b([^>]*)>(.*?)</script>#is', |
| 1035 | - static function ( array $m ): string { | |
| 1065 | + static function ( array $m ) use ( $handle_delayed ): string { | |
| 1036 | 1066 | list( $whole, $attrs, $body ) = $m; |
| 1037 | 1067 | |
| 1038 | 1068 | if ( '' === trim( $body ) ) { |
| 1039 | 1069 | return $whole; |
| @@ -1081,8 +1111,38 @@ | ||
| 1081 | 1111 | if ( preg_match( '#(?<![-\w])id\s*=\s*(["\'])xspeed-#i', $attrs ) ) { |
| 1082 | 1112 | return $whole; |
| 1083 | 1113 | } |
| 1084 | 1114 | |
| 1115 | + // A handle's own inline blocks follow the handle, not only their | |
| 1116 | + // body text. The body rule below decided them alone, so a | |
| 1117 | + // `-js-extra` whose data named a target was parked while its | |
| 1118 | + // script, kept eager by a URL exclusion, ran first and read an | |
| 1119 | + // undefined global. (#549) | |
| 1120 | + // | |
| 1121 | + // Ahead of the exclusion list on purpose. The handle's own tag | |
| 1122 | + // was already weighed against it by handle and URL; a body | |
| 1123 | + // match here would keep the after-code of a delayed script | |
| 1124 | + // eager, running it before the script it calls. | |
| 1125 | + if ( preg_match( '#(?<![-\w])id\s*=\s*(["\'])(.+?)-js-(extra|before|after)\1#i', $attrs, $own ) ) { | |
| 1126 | + $part = strtolower( $own[3] ); | |
| 1127 | + // wp_localize_script data. Early is always safe: it only | |
| 1128 | + // assigns, and its script cannot run before it. | |
| 1129 | + if ( 'extra' === $part ) { | |
| 1130 | + return $whole; | |
| 1131 | + } | |
| 1132 | + if ( isset( $handle_delayed[ $own[2] ] ) ) { | |
| 1133 | + if ( $handle_delayed[ $own[2] ] ) { | |
| 1134 | + return '<script' . self::park_type_attrs( $attrs ) . '>' . $body . '</script>'; | |
| 1135 | + } | |
| 1136 | + // The script runs at load, so its `before` code must too. | |
| 1137 | + // Its `after` code still runs after it if parked, so that | |
| 1138 | + // one is left to the body rule, like any vendor loader. | |
| 1139 | + if ( 'before' === $part ) { | |
| 1140 | + return $whole; | |
| 1141 | + } | |
| 1142 | + } | |
| 1143 | + } | |
| 1144 | + | |
| 1085 | 1145 | // The body stands in for the URL in the lists the src passes |
| 1086 | 1146 | // consult — but NOT via is_delay_target(), whose empty-list |
| 1087 | 1147 | // default is "delay everything". That default is right for a |
| 1088 | 1148 | // tag with a URL and catastrophic here: it would park every |
| @@ -1088,12 +1148,16 @@ | ||
| 1088 | 1148 | // tag with a URL and catastrophic here: it would park every |
| 1089 | 1149 | // inline script on the page. Inline code is delayed only on a |
| 1090 | 1150 | // positive identification — the body names a known vendor |
| 1091 | 1151 | // host, or a fragment the user targeted — and the exclusion |
| 1092 | - // list still wins first. | |
| 1093 | - if ( self::is_excluded_script( '', $body ) ) { | |
| 1152 | + // list still wins first. A target naming a consent manager | |
| 1153 | + // lifts the floor here the same way it does for a src tag; | |
| 1154 | + // without it the same entry delayed the file and left the | |
| 1155 | + // vendor's inline code eager. | |
| 1156 | + if ( self::is_excluded_script( '', $body, true ) ) { | |
| 1094 | 1157 | return $whole; |
| 1095 | 1158 | } |
| 1159 | + | |
| 1096 | 1160 | if ( ! self::matches_known_third_party( $body ) && ! self::matches_user_targets( $body ) ) { |
| 1097 | 1161 | return $whole; |
| 1098 | 1162 | } |
| 1099 | 1163 | |
| @@ -1112,8 +1176,33 @@ | ||
| 1112 | 1176 | return null === $out ? $html : $out; |
| 1113 | 1177 | } |
| 1114 | 1178 | |
| 1115 | 1179 | /** |
| 1180 | + * Whether each enqueued handle's external tag ended up delayed. | |
| 1181 | + * | |
| 1182 | + * Read from the finished HTML rather than recorded as tags are filtered: | |
| 1183 | + * this runs after every pass that can delay a tag (script_loader_tag, the | |
| 1184 | + * late opt-out revert, the raw-tag sweep), so the page itself is the only | |
| 1185 | + * complete answer. | |
| 1186 | + * | |
| 1187 | + * @param string $html Complete page HTML. | |
| 1188 | + * @return array<string,bool> Handle => delayed. | |
| 1189 | + */ | |
| 1190 | + private static function handle_delay_outcomes( string $html ): array { | |
| 1191 | + if ( ! preg_match_all( '#<script\b((?:"[^"]*"|\'[^\']*\'|[^>"\'])*)>#i', $html, $m ) ) { | |
| 1192 | + return array(); | |
| 1193 | + } | |
| 1194 | + $out = array(); | |
| 1195 | + foreach ( $m[1] as $attrs ) { | |
| 1196 | + if ( ! preg_match( '#(?<![-\w])id\s*=\s*(["\'])(.+?)-js\1#i', $attrs, $id ) ) { | |
| 1197 | + continue; | |
| 1198 | + } | |
| 1199 | + $out[ $id[2] ] = false !== stripos( $attrs, 'data-xs-delay' ) || false !== stripos( $attrs, 'data-xs-src' ); | |
| 1200 | + } | |
| 1201 | + return $out; | |
| 1202 | + } | |
| 1203 | + | |
| 1204 | + /** | |
| 1116 | 1205 | * Inline bootstrap that flips delayed scripts on the first user |
| 1117 | 1206 | * interaction. Printed once on wp_footer priority 1000. |
| 1118 | 1207 | */ |
| 1119 | 1208 | public static function print_delay_bootstrap(): void { |
| @@ -1133,70 +1222,49 @@ | ||
| 1133 | 1222 | $opts = self::opts(); |
| 1134 | 1223 | $timeout = isset( $opts['delay_js_timeout'] ) ? (int) $opts['delay_js_timeout'] : 8000; |
| 1135 | 1224 | $timeout = max( 0, min( 60000, $timeout ) ); |
| 1136 | 1225 | |
| 1137 | - // Tiny vanilla bootstrap; keep it self-contained so the page | |
| 1138 | - // has no JS dependencies before the first interaction. | |
| 1139 | - ?> | |
| 1140 | -<script id="xspeed-delay-bootstrap"> | |
| 1141 | -(function(){ | |
| 1142 | - var events=['mousemove','keydown','touchstart','scroll','wheel']; | |
| 1143 | - var fired=false; | |
| 1144 | - function load(){ | |
| 1145 | - if(fired)return;fired=true; | |
| 1146 | - events.forEach(function(e){window.removeEventListener(e,load,{passive:true,capture:true});}); | |
| 1147 | - var delayed=document.querySelectorAll('script[data-xs-delay]'); | |
| 1148 | - delayed.forEach(function(s){ | |
| 1149 | - var n=document.createElement('script'); | |
| 1150 | - // A dynamically-created script is async by default, so replayed | |
| 1151 | - // EXTERNALS would race each other; async=false restores document | |
| 1152 | - // order among the externals. Narrower guarantee, stated plainly: | |
| 1153 | - // a replayed INLINE script still executes synchronously at its | |
| 1154 | - // replaceChild, i.e. possibly before an earlier external has | |
| 1155 | - // finished LOADING — so an inline consumer of a delayed external | |
| 1156 | - // is only safe when both were delayed by explicit user targeting | |
| 1157 | - // (the inline-bound guard keeps the implicit case eager). | |
| 1158 | - n.async=false; | |
| 1159 | - // Nonce hiding: a connected element's nonce CONTENT attribute reads | |
| 1160 | - // as "", so copying it via the attribute loop would hand the clone | |
| 1161 | - // an empty nonce and a nonce-based CSP would block the replay. The | |
| 1162 | - // IDL property still carries the real value. | |
| 1163 | - if(s.nonce){n.nonce=s.nonce;} | |
| 1164 | - Array.prototype.slice.call(s.attributes).forEach(function(a){ | |
| 1165 | - if(a.name==='data-xs-src'){n.setAttribute('src',a.value);return;} | |
| 1166 | - if(a.name==='data-xs-delay')return; | |
| 1167 | - if(a.name==='nonce')return; | |
| 1168 | - // A parked inline tag's ORIGINAL type (module, mostly) rides in | |
| 1169 | - // data-xs-type — restore it, or the replay runs a module as a | |
| 1170 | - // classic script and its imports throw. (#274) | |
| 1171 | - if(a.name==='data-xs-type'){n.setAttribute('type',a.value);return;} | |
| 1172 | - // `type` is what a script IS, not decoration, so it is carried over | |
| 1173 | - // — with ONE exception: our own inline parking marker, which exists | |
| 1174 | - // only to stop the browser executing the original and must not be | |
| 1175 | - // copied onto the replacement. Dropping type wholesale broke two | |
| 1176 | - // things: `type="module"` became a classic script (core's Script | |
| 1177 | - // Modules — Navigation, lightbox, Query Loop — threw "Cannot use | |
| 1178 | - // import statement outside a module" on the default theme), and | |
| 1179 | - // `type="text/plain"`, which is precisely how a consent manager | |
| 1180 | - // parks a blocked third-party script, became executable again. The | |
| 1181 | - // second is a privacy failure, not a broken feature. (#274) | |
| 1182 | - if(a.name==='type'&&a.value==='text/xspeed-delayed')return; | |
| 1183 | - n.setAttribute(a.name,a.value); | |
| 1184 | - }); | |
| 1185 | - if(!s.hasAttribute('data-xs-src')){n.text=s.text;} | |
| 1186 | - s.parentNode.replaceChild(n,s); | |
| 1187 | - }); | |
| 1188 | - } | |
| 1189 | - events.forEach(function(e){window.addEventListener(e,load,{passive:true,capture:true});}); | |
| 1190 | -<?php if ( $timeout > 0 ) : ?> | |
| 1191 | - setTimeout(load,<?php echo (int) $timeout; ?>); | |
| 1192 | -<?php endif; ?> | |
| 1193 | -})(); | |
| 1194 | -</script> | |
| 1195 | - <?php | |
| 1226 | + // The script is includes/js/delay-bootstrap.js, which also carries | |
| 1227 | + // the design notes for the lifecycle replay (#494). `npm run build` | |
| 1228 | + // minifies it into assets/delay-bootstrap.min.js; the timeout goes in | |
| 1229 | + // place of its one placeholder. | |
| 1230 | + // | |
| 1231 | + // The tag goes out through wp_print_inline_script_tag(), like Free's | |
| 1232 | + // other inline scripts, so a CSP plugin's wp_inline_script_attributes | |
| 1233 | + // filter can give it a nonce. Printed bare, a nonce CSP blocked it | |
| 1234 | + // and nothing was ever replayed. | |
| 1235 | + $js = str_replace( 'XSPEED_DELAY_TIMEOUT', (string) $timeout, self::delay_bootstrap_js() ); | |
| 1236 | + wp_print_inline_script_tag( $js, array( 'id' => 'xspeed-delay-bootstrap' ) ); | |
| 1196 | 1237 | } |
| 1197 | 1238 | |
| 1239 | + /** The delay bootstrap's code, read once per request. */ | |
| 1240 | + private static $delay_bootstrap_js = null; | |
| 1241 | + | |
| 1198 | 1242 | /** |
| 1243 | + * The built delay bootstrap, without the line that records its source. | |
| 1244 | + * If the build is missing, the readable source is valid JS too, only | |
| 1245 | + * larger: printing nothing would leave every delayed script parked for | |
| 1246 | + * good, because the tags are already rewritten by the time this runs. | |
| 1247 | + */ | |
| 1248 | + private static function delay_bootstrap_js(): string { | |
| 1249 | + if ( null !== self::$delay_bootstrap_js ) { | |
| 1250 | + return self::$delay_bootstrap_js; | |
| 1251 | + } | |
| 1252 | + $root = dirname( __DIR__ ); | |
| 1253 | + $built = $root . '/assets/delay-bootstrap.min.js'; | |
| 1254 | + // phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents -- a local plugin file, not a remote URL. | |
| 1255 | + $js = is_readable( $built ) ? (string) file_get_contents( $built ) : ''; | |
| 1256 | + if ( '' !== $js ) { | |
| 1257 | + $js = (string) preg_replace( '#\A/\*[^\n]*\*/\n#', '', $js ); | |
| 1258 | + } else { | |
| 1259 | + // phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents -- a local plugin file, not a remote URL. | |
| 1260 | + $js = (string) file_get_contents( $root . '/includes/js/delay-bootstrap.js' ); | |
| 1261 | + } | |
| 1262 | + self::$delay_bootstrap_js = trim( $js ); | |
| 1263 | + return self::$delay_bootstrap_js; | |
| 1264 | + } | |
| 1265 | + | |
| 1266 | + /** | |
| 1199 | 1267 | * Filter: `style_loader_tag` — wrap stylesheets in the |
| 1200 | 1268 | * print → onload="all" pattern so they download non-blocking. |
| 1201 | 1269 | * Pairs with critical CSS workflows. Adds a <noscript> fallback so |
| 1202 | 1270 | * users with JS disabled still get styles applied (via media="all"). |
| @@ -1216,8 +1284,21 @@ | ||
| 1216 | 1284 | // want to fight with explicit author intent. |
| 1217 | 1285 | if ( false === stripos( $tag, 'rel=\'stylesheet\'' ) && false === stripos( $tag, 'rel="stylesheet"' ) ) { |
| 1218 | 1286 | return $tag; |
| 1219 | 1287 | } |
| 1288 | + // No critical CSS for this page: every stylesheet stays blocking. | |
| 1289 | + // | |
| 1290 | + // Deferring a stylesheet only helps when something already styles the | |
| 1291 | + // first screen. Without that, the page paints unstyled and then jumps | |
| 1292 | + // when the sheets arrive. Measured on the Templately Astoria pages | |
| 1293 | + // (Elementor and a block theme): CLS 0.43-1.27 and 15-43 points lower | |
| 1294 | + // on 7 of 8 pages than the same settings without async CSS. The guards | |
| 1295 | + // below narrow the damage; this one removes it. WP Rocket, LiteSpeed, | |
| 1296 | + // Jetpack Boost and FlyingPress likewise never defer CSS without | |
| 1297 | + // critical CSS. (#588) | |
| 1298 | + if ( ! self::page_has_critical_css() ) { | |
| 1299 | + return $tag; | |
| 1300 | + } | |
| 1220 | 1301 | // The stylesheets that lay the page out stay render-blocking. |
| 1221 | 1302 | // |
| 1222 | 1303 | // This transform moves a sheet to AFTER first paint. That is the |
| 1223 | 1304 | // point of it — but a sheet the layout depends on is then missing |
| @@ -1524,12 +1605,19 @@ | ||
| 1524 | 1605 | * than a hard-coded list. |
| 1525 | 1606 | * - WordPress' own BLOCK and layout sheets (`wp-block-library`, |
| 1526 | 1607 | * `global-styles`, `classic-theme-styles`). These style block |
| 1527 | 1608 | * content on the front end and are as structural as the theme's. |
| 1609 | + * - A page builder's GRID sheets: the rows, columns, sections and | |
| 1610 | + * containers everything else sits in (`kadence-blocks-rowlayout`, | |
| 1611 | + * `kadence-blocks-column`, `elementor-frontend`, `elementor-post-N`). | |
| 1612 | + * On a builder page these lay out the hero, not the theme. Deferred, | |
| 1613 | + * the hero painted as one stacked column and then snapped into its | |
| 1614 | + * grid: CLS 0.665 on desktop, from one row. | |
| 1528 | 1615 | * |
| 1529 | - * Everything else — plugin sheets, icon fonts, widget and page-builder | |
| 1530 | - * add-ons, the long tail that makes async CSS worth having — is still | |
| 1531 | - * deferred, so the optimization keeps most of its benefit. | |
| 1616 | + * Everything else — plugin sheets, icon fonts, buttons, forms, the | |
| 1617 | + * builder's per-widget sheets, the long tail that makes async CSS worth | |
| 1618 | + * having — is still deferred, so the optimization keeps most of its | |
| 1619 | + * benefit. | |
| 1532 | 1620 | * |
| 1533 | 1621 | * A site WITH critical CSS can defer these too; that is what the |
| 1534 | 1622 | * `xspeed_async_css_layout_critical` filter is for. |
| 1535 | 1623 | * |
| @@ -1546,19 +1634,21 @@ | ||
| 1546 | 1634 | 'wp-block-library-theme', |
| 1547 | 1635 | 'global-styles', |
| 1548 | 1636 | 'classic-theme-styles', |
| 1549 | 1637 | ); |
| 1550 | - $critical = in_array( $handle, $core, true ); | |
| 1638 | + $critical = in_array( $handle, $core, true ) || self::is_builder_grid_style( $handle ); | |
| 1551 | 1639 | |
| 1552 | 1640 | // The active theme's own sheets. |
| 1553 | 1641 | // |
| 1554 | 1642 | // Matched on the theme stem, but NOT as a bare prefix: a plugin from |
| 1555 | 1643 | // the same vendor shares it (the Kadence theme is `kadence`, while |
| 1556 | - // `kadence-blocks-rowlayout` and `kadence-fonts-gfonts` come from the | |
| 1557 | - // Kadence Blocks PLUGIN and a webfont loader). Treating those as | |
| 1558 | - // layout-critical would leave almost nothing deferred and quietly | |
| 1559 | - // undo the feature. So the stem must be followed by a recognised | |
| 1560 | - // theme-area segment, which is how themes name their split sheets. | |
| 1644 | + // `kadence-blocks-image` and `kadence-fonts-gfonts` come from the | |
| 1645 | + // Kadence Blocks PLUGIN and a webfont loader). Treating every such | |
| 1646 | + // sheet as layout-critical would leave almost nothing deferred and | |
| 1647 | + // quietly undo the feature; the builder's grid sheets are caught | |
| 1648 | + // above by what they do, not whose they are. So the stem must be | |
| 1649 | + // followed by a recognised theme-area segment, which is how themes | |
| 1650 | + // name their split sheets. | |
| 1561 | 1651 | if ( ! $critical && function_exists( 'get_template' ) ) { |
| 1562 | 1652 | $areas = array( |
| 1563 | 1653 | 'style', |
| 1564 | 1654 | 'global', |
| @@ -1603,8 +1693,28 @@ | ||
| 1603 | 1693 | return (bool) apply_filters( 'xspeed_async_css_layout_critical', $critical, $handle ); |
| 1604 | 1694 | } |
| 1605 | 1695 | |
| 1606 | 1696 | /** |
| 1697 | + * Whether a handle is a page builder's grid sheet. | |
| 1698 | + * | |
| 1699 | + * Matched on the last segment of the handle, so a builder that names its | |
| 1700 | + * row sheet `acme-blocks-row-layout` is covered without being listed. The | |
| 1701 | + * segments are the ones that only ever carry structure; a button, image | |
| 1702 | + * or form sheet styles an element inside the grid, and the grid holds its | |
| 1703 | + * place while that sheet loads. | |
| 1704 | + * | |
| 1705 | + * @param string $handle Lowercase stylesheet handle. | |
| 1706 | + */ | |
| 1707 | + private static function is_builder_grid_style( string $handle ): bool { | |
| 1708 | + if ( preg_match( '#(?:^|-)(?:rowlayout|row-layout|column|columns|container|section|grid)$#', $handle ) ) { | |
| 1709 | + return true; | |
| 1710 | + } | |
| 1711 | + // Builders whose grid lives in a sheet named after the builder or the | |
| 1712 | + // post, not after a structural element. | |
| 1713 | + return (bool) preg_match( '#^(?:elementor-frontend|elementor-post-\d+|fl-builder-layout(?:-\d+)?|generateblocks)$#', $handle ); | |
| 1714 | + } | |
| 1715 | + | |
| 1716 | + /** | |
| 1607 | 1717 | * Filter: `style_loader_src` + `script_loader_src` — strip the |
| 1608 | 1718 | * ?ver=X.Y query string that WP appends for cache busting. Some |
| 1609 | 1719 | * CDNs / reverse proxies cache better when the URL has no query. |
| 1610 | 1720 | * |
| @@ -1807,11 +1917,11 @@ | ||
| 1807 | 1917 | ); |
| 1808 | 1918 | |
| 1809 | 1919 | /** |
| 1810 | 1920 | * Consent managers are never deferred, and never delayed by a broad |
| 1811 | - * setting — only an EXPLICIT delay_js_targets entry naming one lifts | |
| 1812 | - * the floor (see is_excluded_script()); the `xspeed_js_exclusion_floor` | |
| 1813 | - * filter remains the code-level override. | |
| 1921 | + * setting — only a delay_js_targets entry that NAMES the vendor lifts | |
| 1922 | + * the floor (see user_named_consent_manager()); the | |
| 1923 | + * `xspeed_js_exclusion_floor` filter remains the code-level override. | |
| 1814 | 1924 | * |
| 1815 | 1925 | * A consent banner is drawn by JavaScript, and it is the one thing on |
| 1816 | 1926 | * the page that has to appear before anything else happens. Delay it |
| 1817 | 1927 | * and a visitor who lands, reads and leaves without touching the page |
| @@ -1893,8 +2003,62 @@ | ||
| 1893 | 2003 | 'surecookie', |
| 1894 | 2004 | ); |
| 1895 | 2005 | |
| 1896 | 2006 | /** |
| 2007 | + * What a site owner types to name each floor entry, and what the admin | |
| 2008 | + * shows them. Keyed by CONSENT_MANAGER_FLOOR token; a test holds the two | |
| 2009 | + * in step. | |
| 2010 | + * | |
| 2011 | + * The keyword is the part of the token a person would actually write | |
| 2012 | + * (`cookiebot`, not `consent.cookiebot.com`), and it is always a substring | |
| 2013 | + * of the token, so an entry that names the vendor this way still matches | |
| 2014 | + * the vendor's URL. A brand name that appears nowhere in the URL | |
| 2015 | + * (`cookieyes`, `onetrust`, `cmplz`) is deliberately not a keyword: it | |
| 2016 | + * could never match the tag, so offering it would promise a lift that | |
| 2017 | + * cannot happen. The exact handle always works as well. | |
| 2018 | + * | |
| 2019 | + * Cookiebot in Usercentrics CMP mode loads from web.cmp.usercentrics.eu, | |
| 2020 | + * so the floor catches it as Usercentrics and `usercentrics` names it, | |
| 2021 | + * not `cookiebot`. | |
| 2022 | + */ | |
| 2023 | + private const CONSENT_MANAGER_NAMES = array( | |
| 2024 | + 'cookie-law-info' => array( 'label' => 'CookieYes', 'keyword' => 'cookie-law-info' ), | |
| 2025 | + 'complianz' => array( 'label' => 'Complianz', 'keyword' => 'complianz' ), | |
| 2026 | + 'notificationx' => array( 'label' => 'NotificationX', 'keyword' => 'notificationx' ), | |
| 2027 | + 'consent.cookiebot.com' => array( 'label' => 'Cookiebot', 'keyword' => 'cookiebot' ), | |
| 2028 | + 'cookie-notice' => array( 'label' => 'Cookie Notice', 'keyword' => 'cookie-notice' ), | |
| 2029 | + 'hu-banner' => array( 'label' => 'Cookie Notice (Cookie Compliance)', 'keyword' => 'hu-banner' ), | |
| 2030 | + 'gdpr-cookie-compliance' => array( 'label' => 'GDPR Cookie Compliance (Moove)', 'keyword' => 'gdpr-cookie-compliance' ), | |
| 2031 | + 'app.termly.io' => array( 'label' => 'Termly', 'keyword' => 'termly' ), | |
| 2032 | + 'usercentrics.eu' => array( 'label' => 'Usercentrics', 'keyword' => 'usercentrics' ), | |
| 2033 | + 'cdn.iubenda.com' => array( 'label' => 'Iubenda', 'keyword' => 'iubenda' ), | |
| 2034 | + 'cdn.cookielaw.org' => array( 'label' => 'OneTrust', 'keyword' => 'cookielaw' ), | |
| 2035 | + 'borlabs-cookie' => array( 'label' => 'Borlabs Cookie', 'keyword' => 'borlabs' ), | |
| 2036 | + 'real-cookie-banner' => array( 'label' => 'Real Cookie Banner', 'keyword' => 'real-cookie-banner' ), | |
| 2037 | + 'surecookie' => array( 'label' => 'SureCookie', 'keyword' => 'surecookie' ), | |
| 2038 | + ); | |
| 2039 | + | |
| 2040 | + /** | |
| 2041 | + * "Label (keyword)" for every built-in consent manager, for the admin. | |
| 2042 | + * | |
| 2043 | + * Reads the built-in list, not the filtered floor: the admin describes | |
| 2044 | + * what ships, and a site that trimmed the floor in code knows it did. | |
| 2045 | + * | |
| 2046 | + * @return string[] | |
| 2047 | + */ | |
| 2048 | + public static function consent_manager_labels(): array { | |
| 2049 | + $out = array(); | |
| 2050 | + foreach ( self::CONSENT_MANAGER_FLOOR as $token ) { | |
| 2051 | + $name = self::CONSENT_MANAGER_NAMES[ $token ] ?? array( | |
| 2052 | + 'label' => $token, | |
| 2053 | + 'keyword' => $token, | |
| 2054 | + ); | |
| 2055 | + $out[] = $name['label'] . ' (' . $name['keyword'] . ')'; | |
| 2056 | + } | |
| 2057 | + return $out; | |
| 2058 | + } | |
| 2059 | + | |
| 2060 | + /** | |
| 1897 | 2061 | * Per-request memo for exclusion_floor(). Null = not resolved. |
| 1898 | 2062 | * |
| 1899 | 2063 | * @var string[]|null |
| 1900 | 2064 | */ |
| @@ -1928,11 +2092,12 @@ | ||
| 1928 | 2092 | /** |
| 1929 | 2093 | * @param string $handle Script handle ('' on the buffer sweep |
| 1930 | 2094 | * when no id survived). |
| 1931 | 2095 | * @param string $src Script URL. |
| 1932 | - * @param bool $named_lifts_floor Delay paths only: a handle/URL the user | |
| 1933 | - * EXPLICITLY typed into delay_js_targets | |
| 1934 | - * passes the consent floor. Typing a | |
| 2096 | + * @param bool $named_lifts_floor Delay paths only: a delay_js_targets | |
| 2097 | + * entry that NAMES the consent manager | |
| 2098 | + * passes the floor (see | |
| 2099 | + * user_named_consent_manager()). Typing a | |
| 1935 | 2100 | * consent manager's name into an |
| 1936 | 2101 | * allow-list is the site owner taking the |
| 1937 | 2102 | * consent-timing decision back — GDPR is |
| 1938 | 2103 | * theirs to weigh, not ours; the floor |
| @@ -1964,10 +2129,13 @@ | ||
| 1964 | 2129 | // one that cleared the textarea has no list at all. Neither may |
| 1965 | 2130 | // hide the banner. (#275) |
| 1966 | 2131 | foreach ( self::exclusion_floor() as $needle ) { |
| 1967 | 2132 | if ( self::target_matches( $needle, $handle, $src ) ) { |
| 1968 | - if ( $named_lifts_floor && self::is_user_named_target( $handle, $src ) ) { | |
| 1969 | - break; | |
| 2133 | + // `continue`, not `break`: a second floor token matching the | |
| 2134 | + // same tag has to be named too, or a filter-added token | |
| 2135 | + // would be lifted by an entry that names only the first. | |
| 2136 | + if ( $named_lifts_floor && self::user_named_consent_manager( $needle, $handle, $src ) ) { | |
| 2137 | + continue; | |
| 1970 | 2138 | } |
| 1971 | 2139 | return true; |
| 1972 | 2140 | } |
| 1973 | 2141 | } |
| @@ -2038,8 +2206,131 @@ | ||
| 2038 | 2206 | } |
| 2039 | 2207 | return false; |
| 2040 | 2208 | } |
| 2041 | 2209 | |
| 2210 | + /** | |
| 2211 | + * Whether a delay_js_targets entry NAMES the consent manager whose floor | |
| 2212 | + * token matched this tag, and so lifts the floor for it. | |
| 2213 | + * | |
| 2214 | + * is_user_named_target() is not enough here: it asks whether any entry | |
| 2215 | + * matches the tag, and a delay target is a URL substring. `/plugins/`, | |
| 2216 | + * `.js`, `min.js`, `frontend` or the site's own host each match every | |
| 2217 | + * consent banner on the page, so one broad entry switched the floor off | |
| 2218 | + * for all of them and brought #275 back. An entry names the vendor when | |
| 2219 | + * it is the exact handle, or when it contains the vendor's keyword (or | |
| 2220 | + * its floor token) and still matches the tag, so `notificationx` and | |
| 2221 | + * `/plugins/notificationx/` lift NotificationX, `termly` cannot lift | |
| 2222 | + * Cookiebot, and `/plugins/` lifts nothing. | |
| 2223 | + * | |
| 2224 | + * A token added through `xspeed_js_exclusion_floor` has no keyword, so | |
| 2225 | + * only an entry containing that token, or the exact handle, names it. | |
| 2226 | + * | |
| 2227 | + * @param string $floor_token The floor entry that matched this tag. | |
| 2228 | + * @param string $handle Script handle ('' when unknown). | |
| 2229 | + * @param string $src Script URL, or the body on the inline pass. | |
| 2230 | + */ | |
| 2231 | + private static function user_named_consent_manager( string $floor_token, string $handle, string $src ): bool { | |
| 2232 | + $opts = self::opts(); | |
| 2233 | + $targets = is_array( $opts['delay_js_targets'] ?? null ) ? $opts['delay_js_targets'] : array(); | |
| 2234 | + $names = array( $floor_token ); | |
| 2235 | + if ( isset( self::CONSENT_MANAGER_NAMES[ $floor_token ] ) ) { | |
| 2236 | + $names[] = self::CONSENT_MANAGER_NAMES[ $floor_token ]['keyword']; | |
| 2237 | + } | |
| 2238 | + foreach ( $targets as $needle ) { | |
| 2239 | + $needle = trim( (string) $needle ); | |
| 2240 | + if ( '' === $needle ) { | |
| 2241 | + continue; | |
| 2242 | + } | |
| 2243 | + $names_it = '' !== $handle && $handle === $needle; | |
| 2244 | + foreach ( $names as $name ) { | |
| 2245 | + if ( false !== stripos( $needle, $name ) ) { | |
| 2246 | + $names_it = true; | |
| 2247 | + break; | |
| 2248 | + } | |
| 2249 | + } | |
| 2250 | + if ( $names_it && self::target_matches( $needle, $handle, $src ) ) { | |
| 2251 | + return true; | |
| 2252 | + } | |
| 2253 | + } | |
| 2254 | + return false; | |
| 2255 | + } | |
| 2256 | + | |
| 2257 | + /** Both toggles on: delay_js and its carry-the-inline-snippets mode. */ | |
| 2258 | + private static function smart_delay_enabled(): bool { | |
| 2259 | + $opts = self::opts(); | |
| 2260 | + return ! empty( $opts['delay_js'] ) && ! empty( $opts['delay_js_smart'] ); | |
| 2261 | + } | |
| 2262 | + | |
| 2263 | + /** | |
| 2264 | + * Would Smart Delay postpone this handle's tag? | |
| 2265 | + * | |
| 2266 | + * The snippet-parking filter runs when WordPress prints a handle's | |
| 2267 | + * `before` snippet — BEFORE script_loader_tag sees the tag itself — so | |
| 2268 | + * the decision cannot be read back from what happened to the tag; both | |
| 2269 | + * sides evaluate this same predicate. It mirrors the handle/src checks | |
| 2270 | + * of delay_script_tag() only: the tag-level outs there (an optimizer | |
| 2271 | + * opt-out attribute, a non-executable type) are invisible here, so a | |
| 2272 | + * tag that keeps itself eager through one of those can still have its | |
| 2273 | + * snippets parked. That parks an init until first interaction rather | |
| 2274 | + * than throwing, and Smart Delay is opt-in — acceptable, and documented | |
| 2275 | + * on the setting. | |
| 2276 | + */ | |
| 2277 | + private static function smart_delays_handle( string $handle ): bool { | |
| 2278 | + if ( '' === $handle ) { | |
| 2279 | + return false; | |
| 2280 | + } | |
| 2281 | + $src = self::original_src( $handle ); | |
| 2282 | + if ( self::is_excluded_script( $handle, $src, true ) ) { | |
| 2283 | + return false; | |
| 2284 | + } | |
| 2285 | + return self::is_delay_target( $handle, $src ); | |
| 2286 | + } | |
| 2287 | + | |
| 2288 | + /** | |
| 2289 | + * Park a delayed handle's own before/after snippet, in Smart Delay mode. | |
| 2290 | + * | |
| 2291 | + * Runs on `wp_inline_script_attributes`, which fires for every inline | |
| 2292 | + * script WordPress prints itself — so it works on pages the HTML buffer | |
| 2293 | + * never filters (a BYPASS route like /cart), where the handle's tag is | |
| 2294 | + * still delayed by script_loader_tag. `-js-extra` stays eager on | |
| 2295 | + * purpose: it is data assignments, harmless early and sometimes read by | |
| 2296 | + * eager code. | |
| 2297 | + * | |
| 2298 | + * @param mixed $attributes Inline script attributes. | |
| 2299 | + * @param string $javascript The snippet body. | |
| 2300 | + * @return mixed | |
| 2301 | + */ | |
| 2302 | + public static function park_smart_inline( $attributes, $javascript = '' ) { | |
| 2303 | + if ( ! is_array( $attributes ) || ! self::smart_delay_enabled() || self::skip_in_non_frontend_context() ) { | |
| 2304 | + return $attributes; | |
| 2305 | + } | |
| 2306 | + $id = isset( $attributes['id'] ) ? (string) $attributes['id'] : ''; | |
| 2307 | + if ( ! preg_match( '#^(.+)-js-(?:before|after)$#', $id, $m ) ) { | |
| 2308 | + return $attributes; | |
| 2309 | + } | |
| 2310 | + if ( ! self::smart_delays_handle( $m[1] ) ) { | |
| 2311 | + return $attributes; | |
| 2312 | + } | |
| 2313 | + $type = isset( $attributes['type'] ) ? (string) $attributes['type'] : ''; | |
| 2314 | + if ( in_array( $type, self::NON_EXECUTABLE_TYPES, true ) ) { | |
| 2315 | + return $attributes; // data, or parked by someone else on purpose. | |
| 2316 | + } | |
| 2317 | + // A delayed document.write replays after the document has closed | |
| 2318 | + // and replaces the page. Same rule as delay_inline_snippets(). | |
| 2319 | + if ( false !== stripos( (string) $javascript, 'document.write' ) ) { | |
| 2320 | + return $attributes; | |
| 2321 | + } | |
| 2322 | + if ( '' !== $type && ! in_array( $type, self::DEFAULT_JS_TYPES, true ) ) { | |
| 2323 | + $stash = (string) preg_replace( '#[^a-z0-9/+.\-]#', '', $type ); | |
| 2324 | + if ( '' !== $stash ) { | |
| 2325 | + $attributes['data-xs-type'] = $stash; | |
| 2326 | + } | |
| 2327 | + } | |
| 2328 | + $attributes['type'] = 'text/xspeed-delayed'; | |
| 2329 | + $attributes['data-xs-delay'] = '1'; | |
| 2330 | + return $attributes; | |
| 2331 | + } | |
| 2332 | + | |
| 2042 | 2333 | private static function is_delay_target( string $handle, string $src ): bool { |
| 2043 | 2334 | $opts = self::opts(); |
| 2044 | 2335 | $targets = is_array( $opts['delay_js_targets'] ?? null ) ? $opts['delay_js_targets'] : array(); |
| 2045 | 2336 | $targets = array_filter( array_map( 'strval', $targets ), static fn( $t ) => '' !== $t ); |
| @@ -2176,11 +2467,13 @@ | ||
| 2176 | 2467 | self::$opts = null; |
| 2177 | 2468 | self::$uploads_base = null; |
| 2178 | 2469 | self::$delay_bootstrap_printed = false; |
| 2179 | 2470 | self::$js_measured_layout = null; |
| 2471 | + self::$has_critical_css = null; | |
| 2180 | 2472 | self::$exclusion_floor = null; |
| 2181 | 2473 | self::$inline_bound_handles = null; |
| 2182 | 2474 | self::$pristine_tag = array(); |
| 2475 | + self::$our_late_attrs = array(); | |
| 2183 | 2476 | } |
| 2184 | 2477 | |
| 2185 | 2478 | /** |
| 2186 | 2479 | * Per-request memo for inline_bound_handles(). Null = not resolved. |
| @@ -2332,8 +2625,41 @@ | ||
| 2332 | 2625 | * |
| 2333 | 2626 | * @var bool|null |
| 2334 | 2627 | */ |
| 2335 | 2628 | private static $js_measured_layout = null; |
| 2629 | + | |
| 2630 | + /** | |
| 2631 | + * Per-request memo for page_has_critical_css(). Null = not resolved. | |
| 2632 | + * | |
| 2633 | + * @var bool|null | |
| 2634 | + */ | |
| 2635 | + private static $has_critical_css = null; | |
| 2636 | + | |
| 2637 | + /** | |
| 2638 | + * Does something inline critical CSS for the page being served? | |
| 2639 | + * | |
| 2640 | + * Free generates none, so the answer comes from the filter: an extension | |
| 2641 | + * that inlines critical CSS for this page returns true, and a site whose | |
| 2642 | + * theme ships its own can too. Resolved once per request, because every | |
| 2643 | + * stylesheet tag asks. | |
| 2644 | + */ | |
| 2645 | + public static function page_has_critical_css(): bool { | |
| 2646 | + if ( null === self::$has_critical_css ) { | |
| 2647 | + /** | |
| 2648 | + * Whether the page being served has critical CSS inlined in its head. | |
| 2649 | + * | |
| 2650 | + * Async CSS defers stylesheets only when this is true; without | |
| 2651 | + * critical CSS it leaves them render-blocking, because deferring | |
| 2652 | + * them makes the page paint unstyled and shift. Return true when | |
| 2653 | + * something inlines critical CSS for this page, or to keep deferring | |
| 2654 | + * without it. | |
| 2655 | + * | |
| 2656 | + * @param bool $has_critical_css Default false. | |
| 2657 | + */ | |
| 2658 | + self::$has_critical_css = (bool) apply_filters( 'xspeed_async_css_page_has_critical_css', false ); | |
| 2659 | + } | |
| 2660 | + return self::$has_critical_css; | |
| 2661 | + } | |
| 2336 | 2662 | |
| 2337 | 2663 | /** |
| 2338 | 2664 | * Scripts that lay out the page by measuring the DOM. |
| 2339 | 2665 | * |
