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Test Info:
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Fixed meta viewport width, zero display width</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<meta name="viewport" content="width=100">
<script src="viewport_helpers.js"></script>
</head>
<body>
<p>Fixed meta viewport width, zero display width</p>
<script type="application/javascript">
"use strict";
add_task(async function valid_width() {
// We choose a 2.5 scaleRatio here to make clear that the later check
// of the viewport height is getting a scaled value.
await SpecialPowers.pushPrefEnv(scaleRatio(2.5));
// We request a zero-width viewport because that triggers a special
// codepath that sets the viewport height to the scaled display height.
let info = getViewportInfo(0, 500);
is(info.width, 100, "width should be 100");
is(info.height, 200, "height should be 200, since 500 / 2.5 = 200");
});
</script>
</body>
</html>