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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>content attribute changes among multiple meta viewport tags</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<meta id="first" name="viewport" content="width=980">
<meta id="second" name="viewport" content="width=device-width, initial-scale=1">
<script src="viewport_helpers.js"></script>
</head>
<body>
<script type="application/javascript">
"use strict";
add_task(async function change_content_attribute() {
await SpecialPowers.pushPrefEnv(scaleRatio(1.0));
let info = getViewportInfo(800, 480);
// The second meta tag is the one we use.
is(info.defaultZoom, 1, "initial zoom is 1");
is(info.width, 800, "width should be 800");
is(info.height, 480, "height should be 480");
// Change the content of the first one.
// eslint-disable-next-line no-undef
first.setAttribute("content", "width=640");
// Now the first one is prior to the second one.
info = getViewportInfo(800, 480);
fuzzeq(info.defaultZoom, 800/640, "initial scale is calculated based on width");
is(info.minZoom, 0.25, "minimum scale defaults to the absolute minimum");
is(info.maxZoom, 10, "maximum scale defaults to the absolute maximum");
is(info.width, 640, "width is the default width");
is(info.height, 480*640/800, "height is proportional to displayHeight");
// Cleat the second content.
// eslint-disable-next-line no-undef
second.setAttribute("content", "");
// The second one is prior to the first one, but the content is empty so
// that we should behave as if there is no meta viewport tag.
info = getViewportInfo(800, 480);
is(info.defaultZoom, 0.25, "initial scale is clamped to the default mimumim scale");
is(info.minZoom, 0.25, "minimum scale defaults to the absolute minimum");
is(info.maxZoom, 10, "maximum scale defaults to the absolute maximum");
is(info.width, 980, "width should be 980");
is(info.height,588, "height is proportional to displayHeight");
});
</script>
</body>
</html>
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