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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>CSS Test: table-layout: fixed - cell in the first row with specified width</title>
<link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />
<link rel="help" href="http://www.w3.org/TR/CSS21/tables.html#fixed-table-layout" />
<link rel="bookmark" href="http://lists.w3.org/Archives/Public/www-style/2011Oct/0502.html" title="[css21] Section 17.5.2.1 should be clarified" />
<link rel="match" href="fixed-table-layout-003e08-ref.xht" />
<meta name="assert" content="A cell in the first row with specified non-auto 'width' sets the width for its column in the absence of a column element with specified non-auto width. This test checks the 'border-collapse: collapse' model with non-zero symetrical horizontal cell padding and with one non-zero horizontal cell borders." />
<style type="text/css"><![CDATA[
div, table {font: 1.25em/1.2 serif;}
table
{
border-collapse: collapse;
table-layout: fixed;
width: 300px;
}
td {padding: 0px 24px;}
td#tested-cell
{
background-color: blue;
border-left: orange solid 72px;
border-right: orange solid 0px;
color: blue;
width: 80px;
}
div#reference
{
background-color: black;
color: black;
margin-left: 32px;
/*
"
In the fixed table layout algorithm, the width of each column is determined as follows:
(...) a cell in the first row with a value other than 'auto' for the 'width' property determines the width for that column. (...)
Any remaining columns equally divide the remaining horizontal table space (minus borders or cell spacing).
"
Section 17.5.2.1 Fixed table layout
http://www.w3.org/TR/CSS21/tables.html#fixed-table-layout
Middle column width calculations
--------------------------------
36px : half of border-left since such border must be split with cell in 1st column
+
24px : padding-left of the cell in the middle column
+
80px : width of the cell in the middle column
+
24px : padding-right of the cell in the middle column
=======
164px : width of the middle column
So,
300px : table set width
-
164px : width of the middle column
======
136px
So, each of the 2 remaining columns must be
half of such extra horizontal table space,
which is 136px divided by 2 == 68px.
1st column width calculations
-----------------------------
24px : padding-left of cell in 1st column
+
(solve) : width of cell in 1st column
+
24px : padding-right of cell in 1st column
+
36px : border-right of cell in 1st column
which is half of border-left of cell in middle column
======
68px : width of 1st column
So, the width of the cell in first column must be exactly -16px !
3rd column width calculations
-----------------------------
24px : padding-left of cell in 3rd column
+
(solve) : width of cell in 3rd column
+
24px : padding-right of cell in 3rd column
=======
68px : width of 3rd column
So, the width of the cell in 3rd column must be exactly 20px.
Finally, the precise horizontal point where the border-right of cell
in first column begins to be drawn, painted is:
24px : padding left of cell in 1st column
+
-16px : width of cell in 1st column
+
24px : padding right of cell in 1st column
=======
32px
Therefore the margin-left: 32px value of the div#reference.
*/
width: 200px;
}
]]></style>
</head>
<body>
<p>Test passes if the orange stripe and blue stripe are as a whole <strong>exactly as wide as</strong> the black stripe.</p>
<table>
<col />
<col />
<col />
<tr>
<td></td>
<td id="tested-cell">E08</td>
<td></td>
</tr>
</table>
<div id="reference">200px wide</div>
</body>
</html>
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