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chromium/third_party/blink/web_tests/external/wpt/html/semantics/tabular-data/processing-model-1/col-span-limits.html 

<!DOCTYPE html>
<title>Limits on col/colgroup.span</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<style>
  div.square {
    height:20px;
    width:20px;
    border:1px solid lime;
  }
  main table {
    border-collapse:collapse;
    border:1px solid blue;
  }
  main table col {
    border-left:2px solid black;
  }
</style>
<div id=log></div>
<main>
<table id=table1>
  <col span=1000>
  <tr>
    <td colspan=999><div class="square"></div></td>
    <td><div class="square"></div></td>
  </tr>
  <tr>
    <td colspan=1000><div class="square"></div></td>
  </tr>
</table>
<br>
These two must look the same, each having 2 cells in one row:
<table id=table2>
  <col span=1000>
  <tr>
    <td colspan=1000><div class="square"></div></td>
    <td><div class="square"></div></td>
  </tr>
</table>
<br>
<table id=table3>
  <col span=1001>
  <tr>
    <td colspan=1000><div class="square"></div></td>
    <td><div class="square"></div></td>
  </tr>
</table>
</main>

<script>
test(() => {
    assert_equals(table1.offsetWidth, 53);
}, "col span of 1000 must work");

test(() => {
    assert_equals(table2.offsetWidth, 51, "table2 width");
    assert_equals(table3.offsetWidth, 51, "table3 width");
}, "col span of 1001 must be treated as 1000");
</script>