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<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta name="viewport" content="width=device-width"/>
<title>The Grid in an overflowing div</title>
<style type="text/css">
html, body {
padding: 0;
border: 0;
margin: 0;
scrollbar-width: none;
}
table {
padding: 0;
margin: 0;
border-top: none;
border-left: none;
border-right: 1px solid black;
border-bottom: 1px solid black;
}
tr {
padding: 0;
border: 0;
margin: 0;
}
td {
/* top border counts as part of height, but
left border doesn't count as part of width.
go figure.
*/
min-height: 99px;
height: 99px;
max-height: 99px;
min-width: 99px;
width: 99px;
max-width: 99px;
padding: 0;
border-left: 1px solid black;
border-top: 1px solid black;
border-right: none;
border-bottom: none;
margin: 0;
font-size: 12px;
text-align: left;
vertical-align: top;
font-family: monospace;
}
</style>
</head>
<body>
<div style="color: red">this text is above the scrolling div. the div below is 300x400</div>
<div id="nest" style="overflow: scroll; scrollbar-width: none; height: 400px; width: 300px">
<table cellspacing="0" cellpadding="0" border="0">
<script type="text/javascript">
var PAGE_SIZE = 2000;
var GRID_SIZE = 100;
var cnt = (PAGE_SIZE / GRID_SIZE);
for (var y = 0; y < cnt; y++) {
document.writeln( "<tr>" );
for (var x = 0; x < cnt; x++) {
var color = ((x + y) % 2) ? "blue" : "red";
document.writeln( "<td style='background-color: " + color + "'></td>" );
}
document.writeln( "</tr>" );
}
</script>
</table>
</div>
<div style="color: red">this text is below the scrolling div</div>
<script>
if (location.search == "?ref") {
// In the reference case we use a CSS transform so that we don't use
// the async-zoom codepath (which is handled differently by WR).
document.documentElement.setAttribute("style", "transform: scale(1.1); transform-origin: top left");
document.documentElement.classList.remove("reftest-wait");
} else {
// In the test case, we want to first paint the unscaled content, so that
// WR populates the picture cache. Then we apply an async zoom and paint
// again for the final snapshot. The bug in this case was that WR wasn't
// properly invalidating the picture cache tiles and so things would
// appear incorrectly.
window.addEventListener("MozAfterPaint", () => {
document.documentElement.setAttribute("reftest-async-zoom", "1.1");
document.documentElement.classList.remove("reftest-wait");
});
}
</script>
</body>
</html>
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