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layout: Implement border-spacing per CSS 2.1 § 17.6.1 and the legacy

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`cellspacing` attribute per HTML5 § 14.3.9.

Table layout code has been refactored to push the spacing down to
rowgroups and rows; this will aid the implementation of
`border-collapse` as well.

This commit also fixes two nasty issues in table layout:

* In fixed layout, extra space would not be divided among columns that
  had auto width but had nonzero minimum width.

* In automatic layout, extra space would be distributed to constrained
  columns as well even if unconstrained columns with percentage equal to
  zero were present.
This commit is contained in:
Patrick Walton 2014-12-17 16:44:37 -08:00
parent e8f1a046c6
commit 586c12ccc4
26 changed files with 690 additions and 208 deletions
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30
tests/ref/legacy_cellspacing_attribute_a.html Normal file
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<!DOCTYPE html>
<html>
<head>
<!-- Tests that the legacy `cellspacing` attribute works. -->
<style>
body, html {
margin: 0;
}
table {
border: none;
padding: 0;
}
tr {
padding: 0;
}
td {
border: none;
padding: 0;
background: blue;
}
</style>
</head>
<body>
<table cellspacing=6>
<tr><td width=32 style="height: 32px;"></td><td width=64></td></tr>
<tr><td width=32 style="height: 32px;"></td><td width=64></td></tr>
</table>
</body>
</html>