author James Teh <>
Wed, 01 Feb 2023 05:02:01 +0000
changeset 651150 dd0fdd1daa69783be36acd5c50544f3694eaa8f9
parent 535618 e9818ea993d02a724e56da4dd9167fc1179de68f
permissions -rw-r--r--
Bug 1813980: Check IsDoc before Parent in RemoteAccessibleBase::ApplyCrossDocOffset. r=morgan We call this function on every ancestor when calculating bounds. RemoteParent() currently requires a hash lookup, so it's more efficient to early return for !IsDoc() first. This is a micro-optimisation, but it might have some impact given that we call this on every ancestor, especially when hit testing, where we call Bounds() a lot. As a bit of drive-by cleanup, use RemoteParent() rather than calling Parent() and IsRemote/AsRemote(). Differential Revision:

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<html lang="en-US" class="reftest-paged"><head>
  <meta charset="utf-8">
  <title>Reference: Fragmentation in print context of height:auto grid, item break-inside:avoid</title>
  <link rel="author" title="Mats Palmgren" href="">
  <style type="text/css">
@page { size:5in 3in; margin:0.5in; }
html,body {
    color:black; background-color:white; font-size:16px; padding:0; margin:0;

.grid {
  display: grid;
  grid-template-columns: 0.6in 0.6in 0.6in;
  grid-auto-rows: 1in;
  border: 0.1in solid;
span { display:block; background:lime; border:0.05in solid black; }
x { display:block; height:0.2in; }
i { display:block; height:0.1in; background:blue; }


<div style="padding-top:1in; background:grey">
<div class="grid" style="grid-template-rows: .91in 1in;">
<span style="height:0.2in"><i style="height:1.5in"></i><x></x></span>
<span style="height:0.25in"><i></i><i></i><i></i><x></x></span>
<span style="grid-area:2/2"><x></x></span>