26971 2014-10-04 15:59:37 +0000 Under the https://html.spec.whatwg.org/#title-on-style: "...the user agent must queue a task to inv [...] 2014-10-14 21:54:11 +0000 1 1 1 Unclassified WHATWG HTML unspecified Other other RESOLVED FIXED https://html.spec.whatwg.org/#title-on-style P3 normal Unsorted 1 contributor ian ian mike contributor oldest_to_newest 112700 0 contributor 2014-10-04 15:59:37 +0000 Specification: https://html.spec.whatwg.org/ Multipage: https://html.spec.whatwg.org/multipage/#title-on-style Complete: https://html.spec.whatwg.org/#title-on-style Referrer: Comment: Under the https://html.spec.whatwg.org/#title-on-style: "...the user agent must queue a task to invoke the update a style block algorithm" for the case when one of the child nodes of the STYLE element is modified by a script, and this script then attempts to access modified style data - it will not be available to the script because the "update a style block" algorithm has not been run at this point (it has been queued) It appears that the browsers don't queue "update a style block" algorithm, but run it immediately after any change has been made to the contents of the STYLE element (see WebKit/Source/WebCore/html/HTMLStyleElement::childrenChanged) Example: <style id="s"></style> <div id="d"></div> <script type="text/javascript"> var s=document.getElementById("s"); s.textContent="#d {background-color:rgb(1, 2, 3);}"; var d=document.getElementById("d"); var c=getComputedStyle(d).backgroundColor; // in IE, XulRunner, WebKit at this point "c" will be equal to "rgb(1, 2, 3)", which makes sense. // however, if implemented according to the spec, "c" will be "transparent" - the default value, // because the changes to the contents of the style element will be applied only // after the current script has completed </script> Solution: change the phrase to: "...the user agent must run a task to invoke the update a style block algorithm" Posted from: 94.75.209.155 User agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0 113154 1 contributor 2014-10-14 21:54:11 +0000 Checked in as WHATWG revision r8838. Check-in comment: Changes to a CSS style sheet take effect immediately https://html5.org/tools/web-apps-tracker?from=8837&to=8838