css/css-tables/tentative/table-width-redistribution-fixed.html

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<title>Fixed table final assignable  distribution</title>
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  main table {
    background: gray;
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  main table:hover { table-layout: auto; } /* useful for comparisons */
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<main>
 <h1>Fixed tables: Compute column computed widths from assignable table width</h1>
<ul>
  <li>auto columns have a min width of 0. Max width still gets computed.</li>
  <li>percent columns have a min width of 0.</li>
  <li>fixed column.min_width is css width. It never changes.</li>
  <li>fixed column.max_width is max(cells.max_width, css width).</li>
  <li>colspan header cells distribute
    <ul>
      <li>max_width evenly between columns.</li>
      <li>do not distribute min width</li>
      <li>percentage evenly between columns</li>
    </ul>
  </li>
</ul>

<h2>Is table treated as fixed?</h2>
<p class="testdesc">table width:auto is not treated as fixed.</p>
<table style="table-layout:fixed; width:auto" data-expected-width=324>
  <tr>
    <td style="width:200px">200</td>
    <td><div style="width:100px">min</div></td>
  </tr>
</table>
<p class="testdesc">table width:px is treated as fixed.</p>
<table style="table-layout:fixed; width:224px" data-expected-width=224>
  <tr>
    <td style="width:200px">200</td>
    <td><div style="width:100px">min</div></td>
  </tr>
</table>
<p class="testdesc">table width:min-content is treated as fixed.</p>
<table style="table-layout:fixed; width:min-content" data-expected-width=224>
  <tr>
    <td style="width:200px">200</td>
    <td><div style="width:100px">min</div></td>
  </tr>
</table>

<h2>Fixed only</h2>

<p class="testdesc">Table: 50px; C0:100/50/100 C1:100/50/75
When table.css_width is &lt; columns.css_width, how is the conflict resolved?
columns.css_width wins</p>
<table style="width:50px" data-expected-width=224>
  <tr>
    <td style="width:100px" data-expected-width=100>
      <div style="width:50px">50</div><div style="width:50px">50</div></td>
    <td style="width:100px" data-expected-width=100>
      <div style="width:50px">50</div><div style="width:25px">25</div></td>
  </tr>
</table>

<p class="testdesc">Table: 300px; C0:100/100/200 C1:100/90/115
When table.css_width is > columns.css_width , how is the conflict resolved?
table.css_width wins</p>
<table style="width:300px" data-expected-width=300>
  <tr>
    <td style="width:100px" data-expected-width=138>
      <div style="width:100px">100</div><div style="width:100px">100</div></td>
    <td style="width:100px" data-expected-width=138>
      <div style="width:90px">90</div><div style="width:25px">25</div></td>
  </tr>
</table>

<p class="testdesc">Table: 300px; C0:100/50/50 C1:100/100/100
Fixed cells must grow, but their min widths differ.
Fixed cells grow in proportion to their css width.
<table style="width:calc(300px + 24px)" data-expected-width=324>
  <tr>
    <td style="width:100px" data-expected-width=150>
      <div style="width:50px">50</div></td>
    <td style="width:100px" data-expected-width=150>
      <div style="width:100px">100</div></td>
  </tr>
</table>

<p class="testdesc">Table: 50px; C0:100/50/50 C1:100/100/100
What happens when column.min_width > column.css_width
column.css_width wins over column.min_width.
<table style="width:100px" data-expected-width=224>
  <tr>
    <td style="width:100px" data-expected-width=100>
      <div style="width:200px"></div></td>
    <td style="width:100px" data-expected-width=100>
      <div style="width:200px"></div></td>
  </tr>
</table>

<p class="testdesc">Table: 1px.
What happens to min_width when multiple cells specify css_width of the same column?
1st cell wins.
<table style="width:1px" data-expected-width=116>
  <tr>
    <td style="width:100px" data-expected-width=100>
      <div style="width:200px">200</div></td>
  </tr>
      <td style="width:150px" data-expected-width=100>
        <div style="width:150px">150</div></td>
  </tr>
</table>

<h2>Auto only</h2>

<p class="testdesc">Width is distributed evenly
</p>
<table style="width:548px">
  <tr>
    <td data-expected-width=100><div style="width:10px;height:30px"></div></td>
    <td data-expected-width=100><div style="width:20px;height:30px"></div></td>
    <td data-expected-width=100><div style="width:30px;height:30px"></div></td>
    <td data-expected-width=100><div style="width:40px;height:30px"></div></td>
    <td data-expected-width=100><div style="width:120px;height:30px"></div></td>
  </tr>
</table>

<h2>Colspan distribution</h2>

<p class="testdesc">Table: 1px
Does column.min_width change with colspan distribution from later rows to first row?
No
<table style="width:1px" data-expected-width=74>
  <tr>
    <td data-expected-width=0>
      <div style="width:50px"></div></td>
    <td style="width:50px" data-expected-width=50>
      <div style="width:50px"></div></td>
  </tr>
  <tr>
    <td colspan=2 style="width:200px" data-expected-width=58>
      <div style="width:200px"></div></td>
  </tr>
</table>

<p class="testdesc">Table: 632px
Does column.percent change with colspan distribution?
No.
<table style="width:632px" data-expected-width=632>
  <tr>
    <td data-expected-width=360>
      <div style="width:50px"></div></td>
    <td style="width:20%"  data-expected-width=120>
      <div style="width:50px"></div></td>
    <td style="width:20%" data-expected-width=120></td>
  </tr>
  <tr>
    <td colspan="2" style="width:90%">
      <div style="width:100px"></div></td>
    <td>auto</td>
  </tr>
</table>

<h2>Colspan header cells</h2>
<section>
<ol>
  <li>Fixed/percentage colspan cells get distributed evenly.</li>
  <li>Auto cells</li>
</ol>

<p class="testdesc">Assignable: 400px
Fixed header cells with colspan.
Columns divded evenly</p>
<p class="error">Legacy Chrome is slightly off, something about spacing and wide cells.</p>
<table style="width:calc(600px + 40px)" data-expected-width=640>
  <tr>
    <td colspan=2 style="width:108px" data-expected-width=208>108</td>
    <td colspan=2 style="width:208px" data-expected-width=408>208</td>
  </tr>
  <tr>
    <td data-expected-width=100>1</td>
    <td>1</td>
    <td data-expected-width=200>1</td>
    <td>1</td>
  </tr>
</table>

<p class="testdesc">Assignable: 400px, C0:40% C1:20% C2:40%
Percentage header cells with colspan
C0 splits into C0.0 and C0.1, 16px each with 20%
C1 splits into C1.0 and C1.1, 6px each with 10%
Assignable width is 400, everyone gets according to percent.
80/80/40/40/160.</p>
<p class="error">Firefox is slightly off, with C2 taking 6px more. Unknown what math is used to get this answer.</p>
<table style="width:448px" data-expected-width=448>
  <tr>
    <td colspan=2 style="width:40%" data-expected-width=168><div style="width:40px"></div></td>
    <td colspan=2 style="width:20%" data-expected-width=88><div style="width:160px"></div></td>
    <td style="width:40%" data-expected-width=160><div style="width:40px"></div></td>
  </tr>
  <tr>
    <td data-expected-width=80>Auto</td>
    <td data-expected-width=80>Auto</td>
    <td data-expected-width=40>Auto</td>
    <td data-expected-width=40>Auto</td>
    <td data-expected-width=160>Auto</td>
  </tr>
</table>

<p class="testdesc">Assignable: 1px, C0 Auto/100 colspan=2 , C1 100/Auto
Auto header cells with colspan, table is min width
min_width does not get redistributed.
</p>
<table style="width:1px" data-expected-width=132>
  <tr>
    <td colspan=2 data-expected-width=8>
      <div style="width:100px">100</div></td>
    <td style="width:100px" data-expected-width=100>100</td>
  </tr>
  <tr>
    <td data-expected-width=0>x</td>
    <td data-expected-width=0>x</td>
    <td data-expected-width=100>x</td>
  </tr>
</table>

<p class="testdesc">Assignable: 200; C0: colspan:2 Auto C1:colspan 8 Auto
Auto colspan cells, and nothing else. Tricky because this means that internally
table has to represent 8 cells, and wide cells that span beyond table width
are usually truncated.
C0: 20*2+8=48, C1: 20*8 + 7*8=216</p>
<table style="width:calc(200px + 88px)" data-expected-width=288>
  <tr>
    <td colspan=2 style="height:20px" data-expected-width=48></td>
    <td colspan=8 style="height:20px" data-expected-width=216></td>
  </tr>
</table>

<h2>Percentage only</h2>

<p class="testdesc">Assignable: 100px;columns add to 100%, auto width
Columns are exact percentage size.
<table style="width:calc(100px + 32px)" data-expected-width=132>
  <tr>
    <td style="width:50%" data-expected-width=50>50%</td>
    <td style="width:30%" data-expected-width=30>30%</td>
    <td style="width:20%" data-expected-width=20>20%</td>
  </tr>
</table>

<p class="testdesc">Assignable: 100px;columns add to 50%, auto width
Columns grow proportional to percent.
<table style="width:calc(100px + 32px)" data-expected-width=132>
  <tr>
    <td style="width:25%" data-expected-width=50>25%</td>
    <td style="width:15%" data-expected-width=30>15%</td>
    <td style="width:10%" data-expected-width=20>10%</td>
  </tr>
</table>


<p class="testdesc">Assignable: 100px;columns add to 50%, with min width
Min width is ignored.
<table style="width:calc(100px + 32px)" data-expected-width=132>
  <tr>
    <td style="width:50%" data-expected-width=50><div style="width:50px">50</div></td>
    <td style="width:30%" data-expected-width=30><div style="width:50px">50</div></td>
    <td style="width:20%" data-expected-width=20><div style="width:50px">50</div></td>
  </tr>
</table>

<p class="testdesc">Assignable: 100px;columns add to 1000%
Columns are scaled so they add up to 100%
<table style="width:calc(100px + 32px)" data-expected-width=132>
  <tr>
    <td style="width:200%" data-expected-width=20><div style="width:50px">50</div></td>
    <td style="width:300%" data-expected-width=30><div style="width:50px">50</div></td>
    <td style="width:500%" data-expected-width=50><div style="width:50px">50</div></td>
  </tr>
</table>



<h2>Percentage/auto/fixed mix</h2>

<p class="testdesc">Assignable: 100px;C0:50% C1:100px C2: Auto
C0, C1 get assigned values, C2 fills the rest.
<table style="width:calc(100px + 32px)" data-expected-width=132>
  <tr>
    <td style="width:50%" data-expected-width=50>50%</td>
    <td style="width:30px" data-expected-width=30>30px</td>
    <td data-expected-width=20></td>
  </tr>
</table>

<p class="testdesc">Assignable: 100px;C0:50% C1:50px
Clean split
<table style="width:calc(100px + 24px)" data-expected-width=124>
  <tr>
    <td style="width:50%" data-expected-width=50>50%</td>
    <td style="width:50px" data-expected-width=50>50px</td>
  </tr>
</table>

<p class="testdesc">Assignable: 100px;C0:20% C1:60% C2:60px
Overconstrained: widths add up to 140.
Fixed widths get distributed first, percentage takes the rest.
<table style="width:calc(100px + 32px)" data-expected-width=132>
  <tr>
    <td style="width:20%" data-expected-width=10>20%</td>
    <td style="width:60%" data-expected-width=30>60%</td>
    <td style="width:60px" data-expected-width=60>60px</td>
  </tr>
</table>

<h2>Fixed 0-width columns</h2>
<p>Fixed 0-width columns are an exception. They are treated as a mix of fixed and auto columns.</p>
  <li>If there are only zero-width columns, width is distibuted evenly.</li>
  <li>If there are any fixed,percentage, or auto columns,  0-width columns do not grow.</li>
<p class="testdesc">Assignable: 100px;C0:0-width, C1:0-width
  All 0-width columns grow.
</p>
<table style="width:calc(100px + 24px)" data-expected-width=124>
  <tr>
    <td style="width:0" data-expected-width=50>0</td>
    <td style="width:0" data-expected-width=50>0</td>
  </tr>
</table>
<p class="testdesc">Assignable: 100px;C0:0-width, C1:auto
  0-width column does not grow.
</p>
<table style="width:calc(100px + 24px)" data-expected-width=124>
  <tr>
    <td style="width:0" data-expected-width=0>0</td>
    <td style="width:auto" data-expected-width=100>0</td>
  </tr>
</table>
<p class="testdesc">Assignable: 100px;C0:0-width, C1:50px
  0-width column does not grow.
</p>
<table style="width:calc(100px + 24px)" data-expected-width=124>
  <tr>
    <td style="width:0" data-expected-width=0>0</td>
    <td style="width:50px" data-expected-width=100>0</td>
  </tr>
</table>
<p class="testdesc">Assignable: 100px;C0:0-width, C1:50%
  0-width column does not grow.
</p>
<table style="width:calc(100px + 24px)" data-expected-width=124>
  <tr>
    <td style="width:0" data-expected-width=0>0</td>
    <td style="width:50%" data-expected-width=100>0</td>
  </tr>
</table>

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