- From: poot <cvsmail@w3.org>
- Date: Fri, 28 Oct 2011 18:59:58 -0400
- To: public-html-diffs@w3.org
hixie: Tweak the algorithm for <img> loading to avoid multiple network
requests when src='' is set multiple times in a row. (whatwg r6780)
http://dev.w3.org/cvsweb/html5/spec/Overview.html?r1=1.5428&r2=1.5429&f=h
http://html5.org/tools/web-apps-tracker?from=6779&to=6780
===================================================================
RCS file: /sources/public/html5/spec/Overview.html,v
retrieving revision 1.5428
retrieving revision 1.5429
diff -u -d -r1.5428 -r1.5429
--- Overview.html 28 Oct 2011 22:49:09 -0000 1.5428
+++ Overview.html 28 Oct 2011 22:59:44 -0000 1.5429
@@ -18508,15 +18508,39 @@
<li><p>If the user agent cannot support images, or its support for
images has been disabled, then abort these steps.</li>
- <li><p>If the element's <code title="attr-img-src"><a href="#attr-img-src">src</a></code>
- attribute's value is the empty string, then set the element to the
- <a href="#img-error" title="img-error">broken</a> state, <a href="#queue-a-task">queue a
- task</a> to <a href="#fire-a-simple-event">fire a simple event</a> named <code title="event-error">error</code> at the <code><a href="#the-img-element">img</a></code> element,
- and abort these steps.</li>
+ <li><p>Asynchronously <a href="#await-a-stable-state">await a stable state</a>, allowing
+ the <a href="#concept-task" title="concept-task">task</a> that invoked this
+ algorithm to continue. The <a href="#synchronous-section">synchronous section</a>
+ consists of all the remaining steps of this algorithm until the
+ algorithm says the <a href="#synchronous-section">synchronous section</a> has
+ ended. (Steps in <a href="#synchronous-section" title="synchronous section">synchronous
+ sections</a> are marked with ⌛.)</li>
<li>
- <p><a href="#resolve-a-url" title="resolve a url">Resolve</a> the value
+ <p>⌛ If another instance of this algorithm for this
+ <code><a href="#the-img-element">img</a></code> element was started after this instance, then
+ abort these steps. Only the last instance takes effect, to avoid
+ multiple requests when the <code title="attr-img-src"><a href="#attr-img-src">src</a></code>
+ attribute is set multiple times in a row, or when the <code title="attr-img-src"><a href="#attr-img-src">src</a></code> and <code title="attr-img-crossorigin"><a href="#attr-img-crossorigin">crossorigin</a></code> attributes are
+ both set in succession.</p>
+
+ </li>
+
+ <li>
+
+ <p>⌛ If the element's <code title="attr-img-src"><a href="#attr-img-src">src</a></code>
+ attribute is missing or its value is the empty string, then set
+ the element to the <a href="#img-error" title="img-error">broken</a> state,
+ <a href="#queue-a-task">queue a task</a> to <a href="#fire-a-simple-event">fire a simple event</a>
+ named <code title="event-error">error</code> at the
+ <code><a href="#the-img-element">img</a></code> element, and abort these steps.</p>
+
+ </li>
+
+ <li>
+
+ <p>⌛ <a href="#resolve-a-url" title="resolve a url">Resolve</a> the value
of the element's <code title="attr-img-src"><a href="#attr-img-src">src</a></code> attribute,
relative to the element.</p>
@@ -18524,8 +18548,8 @@
<p>Otherwise, do a <a href="#potentially-cors-enabled-fetch">potentially CORS-enabled fetch</a> of
the resulting <a href="#absolute-url">absolute URL</a>, with the <i>mode</i>
- being the state of the element's <code title="attr-img-crossorigin"><a href="#attr-img-crossorigin">crossorigin</a></code> content
- attribute, the <i title="">origin</i> being the <a href="#origin">origin</a> of the
+ being the state of the element's <code title="attr-img-crossorigin"><a href="#attr-img-crossorigin">crossorigin</a></code> content attribute,
+ the <i title="">origin</i> being the <a href="#origin">origin</a> of the
<code><a href="#the-img-element">img</a></code> element's <code><a href="#document">Document</a></code>, and the
<i>default origin behaviour</i> set to <i>taint</i>.</p>
Received on Friday, 28 October 2011 23:00:03 UTC