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131 lines
4.7 KiB
HTML
131 lines
4.7 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<!--
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https://bugzilla.mozilla.org/show_bug.cgi?id=1166138
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-->
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<head>
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<meta charset="utf-8">
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<title>Test for Bug 1166138</title>
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<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<script type="text/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
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</head>
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<body>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1166138">Mozilla Bug 1166138</a>
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<p id="display"></p>
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<div id="content" style="display: none">
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</div>
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<img srcset="file_bug1166138_1x.png 1x, file_bug1166138_2x.png 2x"
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src="file_bug1166138_def.png"
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onload="onLoad()">
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<script type="application/javascript">
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var img1x = "http://mochi.test:8888/tests/dom/html/test/file_bug1166138_1x.png";
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var img2x = "http://mochi.test:8888/tests/dom/html/test/file_bug1166138_2x.png";
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var imgdef = "http://mochi.test:8888/tests/dom/html/test/file_bug1166138_def.png";
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var onLoadCallback = null;
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var done = false;
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var startPromise = new Promise((a) => {
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onLoadCallback = () => {
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var image = document.querySelector('img');
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// If we aren't starting at 2x scale, resize to 2x scale, and wait for a load
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if (image.currentSrc != img2x) {
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onLoadCallback = a;
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SpecialPowers.pushPrefEnv({'set': [['layout.css.devPixelsPerPx', 2]]});
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} else {
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a();
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}
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};
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});
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// if aLoad is true, waits for a load event. Otherwise, spins the event loop twice to
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// ensure that no events were queued to be fired.
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function spin(aLoad) {
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if (aLoad) {
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return new Promise((a) => {
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ok(!onLoadCallback, "Shouldn't be an existing callback");
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onLoadCallback = a;
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});
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} else {
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return new Promise((a) => SimpleTest.executeSoon(() => SimpleTest.executeSoon(a)));
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}
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}
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function onLoad() {
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if (done) return;
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ok(onLoadCallback, "Expected a load event");
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if (onLoadCallback) {
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var cb = onLoadCallback;
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onLoadCallback = null;
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cb();
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}
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}
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add_task(function* () {
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yield startPromise;
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var image = document.querySelector('img');
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is(image.currentSrc, img2x, "initial scale must be 2x");
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SpecialPowers.pushPrefEnv({'set': [['layout.css.devPixelsPerPx', 1]]});
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yield spin(true);
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is(image.currentSrc, img1x, "pre-existing img tag to 1x");
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SpecialPowers.pushPrefEnv({'set': [['layout.css.devPixelsPerPx', 2]]});
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yield spin(true);
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is(image.currentSrc, img2x, "pre-existing img tag to 2x");
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// Try removing & re-adding the image
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document.body.removeChild(image);
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SpecialPowers.pushPrefEnv({'set': [['layout.css.devPixelsPerPx', 1]]});
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yield spin(false); // No load should occur because the element is unbound
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document.body.appendChild(image);
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yield spin(true);
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is(image.currentSrc, img1x, "remove and re-add tag after changing to 1x");
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document.body.removeChild(image);
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SpecialPowers.pushPrefEnv({'set': [['layout.css.devPixelsPerPx', 2]]});
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yield spin(false); // No load should occur because the element is unbound
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document.body.appendChild(image);
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yield spin(true);
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is(image.currentSrc, img2x, "remove and re-add tag after changing to 2x");
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// get rid of the srcset attribute! It should become the default
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image.removeAttribute('srcset');
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yield spin(true);
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is(image.currentSrc, imgdef, "remove srcset attribute");
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// Setting srcset again should return it to the correct value
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image.setAttribute('srcset', "file_bug1166138_1x.png 1x, file_bug1166138_2x.png 2x");
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yield spin(true);
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is(image.currentSrc, img2x, "restore srcset attribute");
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// Create a new image
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var newImage = document.createElement('img');
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// Switch load listening over to newImage
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newImage.addEventListener('load', onLoad);
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image.removeEventListener('load', onLoad);
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document.body.appendChild(newImage);
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yield spin(false); // no load event should fire - as the image has no attributes
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is(newImage.currentSrc, "", "New element with no attributes");
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newImage.setAttribute('srcset', "file_bug1166138_1x.png 1x, file_bug1166138_2x.png 2x");
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yield spin(true);
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is(newImage.currentSrc, img2x, "Adding srcset attribute");
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SpecialPowers.pushPrefEnv({'set': [['layout.css.devPixelsPerPx', 1]]});
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yield spin(true);
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is(newImage.currentSrc, img1x, "new image after switching to 1x");
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is(image.currentSrc, img1x, "old image after switching to 1x");
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// Clear the listener
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done = true;
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});
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</script>
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</body>
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</html>
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