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Test Info:

<?xml version="1.0" encoding="UTF-8"?>
Any copyright is dedicated to the Public Domain.
This test verifies that we don't create anonymous grid items around
runs of inline content that are _purely_ whitespace.
The test uses "white-space: pre", to try to tempt us into honoring
that whitespace. (but we should resist that temptation).
The test also uses 'justify-content: space-around' to be sure we can
tell whether anonymous grid items are being created around the whitespace
(since they'd claim a share of the packing space if they were there).
<title>CSS Test: Test that anonymous grid items aren't created for pure-whitespace inline content</title>
<link rel="author" title="Daniel Holbert" href=""/>
<link rel="help" href=""/>
<link rel="match" href="grid-whitespace-handling-1-ref.xhtml"/>
div { height: 100px; }
div.grid {
white-space: pre;
border: 1px dashed blue;
width: 200px;
display: grid;
justify-content: space-around;
div.a {
width: 30px;
background: lightgreen;
div.b {
width: 20px;
background: lightblue;
img { width: 40px; }
<!-- whitespace & tab after grid item -->
<div class="grid"><div class="a"/> </div>
<!-- 2 spaces before grid item -->
<div class="grid"> <div class="a"/><div class="b"/></div>
<!-- newline & whitespace between grid items -->
<div class="grid"><img src="support/solidblue.png"/>
<img src="support/solidblue.png"/></div>