<!DOCTYPE html>
<html>
<head>
<style>
body {
margin: 5px;
}
table {
border-collapse: collapse;
}
td {
background: skyblue;
border: 1px solid black;
}
#measure {
position: absolute;
top: -500px;
visibility: hidden;
}
</style>
<script src="../../resources/js-test.js"></script>
</head>
<body>
<table id="main" cellspacing="0" border="0" cellpadding="0">
<tr>
<td>style.height</td>
<td>rect.height</td>
<td>rect.bottom - rect.top</td>
</tr>
<tr><td>a</td><td>b</td><td>c</td></tr>
<tr><td>a</td><td>b</td><td>c</td></tr>
<tr><td>a</td><td>b</td><td>c</td></tr>
<tr><td>a</td><td>b</td><td>c</td></tr>
<tr><td>a</td><td>b</td><td>c</td></tr>
<tr><td>a</td><td>b</td><td>c</td></tr>
<tr><td>a</td><td>b</td><td>c</td></tr>
<tr><td>a</td><td>b</td><td>c</td></tr>
<tr><td>a</td><td>b</td><td>c</td></tr>
</table>
<p>
This tests whether table row heights are stable by measuring the
height of a row, assigning that height to another row and then
measuring it.
For each row the numbers in the three cells should be the same.
</p>
<p>
<a href="https://bugs.webkit.org/show_bug.cgi?id=88813">Bug 88813</a>
</p>
<table id="measure" cellspacing="0" border="0" cellpadding="0">
<tr><td>Measurement</td><td>table</td><td>...</td></tr>
</table>
<script>
var mainTable = document.getElementById('main');
var measureTable = document.getElementById('measure');
var rowHeights = [];
function r(n) {
return Math.round(n * 10) / 10;
}
function computeHeights()
{
rowHeights.length = 0;
var rowElement = measureTable.tBodies[0].rows[0];
for (var i = 0; i < mainTable.tBodies[0].rows.length; i++) {
// Set the size to a subpixel value, the exact value isn't
// important but each row should have a different height.
// However, smallest size (after zoom adjustment) has to
// be larger than 22, as this is the minimal size set by
// the font.
var height = r(26 + (20 + i) * 0.93 + i);
rowElement.style.height = height + 'px';
rect = rowElement.getBoundingClientRect();
rowHeights.push(rect.bottom - rect.top);
}
}
function testHeights(zoom)
{
document.body.style.zoom = zoom;
computeHeights();
var rows = mainTable.tBodies[0].rows;
for (var i = 0; i < rows.length; i++) {
var rowElement = rows[i];
rowElement.style.height = rowHeights[i] + 'px';
var rect = rowElement.getBoundingClientRect();
if (i) {
rowElement.cells[0].firstChild.nodeValue = r(rowHeights[i]);
rowElement.cells[1].firstChild.nodeValue = r(rect.height);
rowElement.cells[2].firstChild.nodeValue = r(rect.bottom - rect.top);
}
}
var failures = 0;
for (var i = 0; i < rows.length; i++) {
var rect = rows[i].getBoundingClientRect();
// Rounding errors cause inaccurate results, so need to equal sizes with an epsilon
if (Math.abs(r(rowHeights[i]) - r(rect.height / zoom)) > 0.11 ) {
testFailed('At ' + r(zoom * 100) + '% zoom getBoundingClientRect returned a height of ' + r(rect.height / zoom) + ', expected ' + r(rowHeights[i]) + '.');
failures++;
}
if (Math.abs((rowHeights[i]) - r((rect.bottom - rect.top) / zoom)) > 0.11) {
testFailed('At ' + r(zoom * 100) + '% zoom getBoundingClientRect returned a rect with bottom - top of ' + r((rect.bottom - rect.top) / zoom) + ', expected ' + rowHeights[i] + '.');
failures++;
}
}
if (!failures)
testPassed('At ' + r(zoom * 100) + '% zoom all heights matched.');
}
testHeights(0.5);
testHeights(0.75);
testHeights(0.9);
testHeights(1.1);
testHeights(1.25);
testHeights(1.33);
testHeights(1.5);
testHeights(1.75);
testHeights(2);
testHeights(1);
if (window.testRunner)
document.getElementById('main').style.display = 'none';
</script>
</body>
</html>
Codebase Browser
chromium