Don't allow column spanners inside transforms.

A transform establishes a containing block for "everything", including fixed-positioned descendants. Letting spanners escape this seems strange, and it causes trouble for accessibility in our implementation. See w3c/csswg-drafts#6805 Bug: 1267847, 1225860 Change-Id: Ibcf9af327824a4683d4b33935c3bc28abe61f998
web-platform-tests · Dec 2, 2021 · 1731efb · 1731efb
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diff --git a/css/css-multicol/multicol-span-all-017-ref.html b/css/css-multicol/multicol-span-all-017-ref.html
diff --git a/css/css-multicol/multicol-span-all-017.html b/css/css-multicol/multicol-span-all-017.html
diff --git a/css/css-multicol/multicol-span-all-017.tentative.html b/css/css-multicol/multicol-span-all-017.tentative.html
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+<!DOCTYPE html>
+<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
+<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/6805">
+<meta name="assert" content="Test that column-span all inside a transform doesn't create a spanner">
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+<div style="columns:2; column-fill:auto; column-gap:0; width:100px; height:100px; background:red;">
+  <div style="transform:scale(1);">
+    <div style="column-span:all; width:50px; height:200px; background:green;"></div>
+  </div>
+</div>