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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Test for drawSnapshot</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/WindowSnapshot.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<style>
html {
height: 2000px;
overflow: hidden;
}
header {
position: fixed;
background: red;
display: block;
left: 0;
right: 0;
top: 0;
height: 200px;
}
</style>
<script type="application/javascript">
function make_canvas() {
var canvas = document.createElement("canvas");
canvas.setAttribute("height", 2000);
canvas.setAttribute("width", 500);
return canvas;
}
SimpleTest.waitForExplicitFinish();
window.addEventListener("load", runTests);
window.scrollTo(0, 1000);
async function runTests(event) {
var testCanvas = make_canvas();
var testCx = testCanvas.getContext("2d");
var testWrapCx = SpecialPowers.wrap(testCx);
// Take a snapshot of the page while scrolled down, so that the fixed header will
// be visually in the middle of the root scroll frame, but should still be at the
// top of the snapshot (since snapshots with a rect are taken relative to the document).
var rect = new window.DOMRect(0, 0, 500, 2000);
let image = await SpecialPowers.snapshotContext(window, rect, "rgb(255, 255, 255)", true);
testWrapCx.drawImage(image, 0, 0);
var refCanvas = make_canvas();
var refCx = refCanvas.getContext("2d");
// Construct a reference image with an equivalent red square at the top.
refCx.fillStyle = "white";
refCx.fillRect(0, 0, 500, 2000);
refCx.fillStyle = "red";
refCx.fillRect(0, 0, 500, 200);
assertSnapshots(testCanvas, refCanvas, true, null, "position:fixed element with scrolling", "reference");
SimpleTest.finish();
}
</script>
</head>
<body>
<header></header>
</body>
</html>
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