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paint: Clamp Pinch Zoom factor within <meta> viewport's scale #58805

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paint: Clamp Pinch Zoom factor within <meta> viewport's scale #58805

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48 changes: 48 additions & 0 deletions visual-viewport/viewport-scale-clamped.html
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<!DOCTYPE html>
<html>

<head>
<meta charset="utf-8">
<title>Viewport Scale Clamped: Not Pinch Zoomable</title>
<link rel=help href="https://github.com/w3c/csswg-drafts/issues/9004">
<link rel=help href="https://github.com/servo/servo/issues/40390">
<link rel="author" title="Shubham Gupta" href="mailto:shubham13297@gmail.com">
<meta name="assert" content="The page can not be pinch-zoom.">
<meta name="viewport" content="minimum-scale=1, maximum-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<style>
body {
height: 200vh;
width: 200vw;
margin: 0;
overflow: hidden;
}
</style>
</head>

<body>
<div style="font-size: 50px;">This page can not be pinch zoomed, it is clamped using meta viewport scale.</div>
<script> promise_test(async () => {
const x = 200, y = 200;
const initialScale = window.visualViewport.scale;
// Perform pinch zoom
await new test_driver.Actions(defaultTickDuration = 0)
.addPointer("f1", "touch")
.addPointer("f2", "touch")
.pointerMove(x, y, { origin: "viewport", sourceName: "f1" })
.pointerMove(x + 10, y + 10, { origin: "viewport", sourceName: "f2" })
.pointerDown({ sourceName: "f1" })
.pointerDown({ sourceName: "f2" })
.pointerMove(x - 30, y - 30, { origin: "viewport", sourceName: "f1", duration: 0 })
.pointerMove(x + 30, y + 30, { origin: "viewport", sourceName: "f2", duration: 0 })
.pointerUp({ sourceName: "f1" })
.pointerUp({ sourceName: "f2" }).send();
assert_equals(window.visualViewport.scale, initialScale, "Scale should be same");
}) </script>
</body>

</html>
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