layout: Do not assume layout data structures exist during queries

mrobinson · servo-wpt-sync · commit 5d04d0928431 · 2026-04-29T20:47:52.000+02:00
Data structures, such as the fragment tree and and stacking context
tree, might not exist even after a layout if there is no root element.
This change makes it so that the code stops asusming they exist. This
does expose us to cases where logic errors may mean we try to run a
script query without running the appropriate phase of layout first, but
that is better than panicking.

Signed-off-by: Martin Robinson &lt;mrobinson@igalia.com&gt;
diff --git a/dom/nodes/crashtests/documentElement-remove-descendant-query.html b/dom/nodes/crashtests/documentElement-remove-descendant-query.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<link rel="help" href="https://github.com/servo/servo/issues/44536">
+<span id="span"></span>
+<script>
+  var span = document.getElementById("span");
+  document.documentElement.remove();
+  span.offsetHeight;
+</script>
+
+
