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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Text Level 3: glyphs can only hang at the edge of a line</title>
+<link rel="author" title="Andreu Botella" href="mailto:abotella@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#hanging">
+<link rel="help" href="https://drafts.csswg.org/css-text-3/#white-space-phase-2">
+<link rel="match" href="/css/reference/ref-filled-green-100px-square.xht">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<meta name="assert" content="Glyphs can't hang at the end of the line if there are non-hanging glyphs after them in the line">
+
+<style>
+  div {
+    font: 25px/1 Ahem;
+    width: 5ch;
+    height: 4ch;
+    margin-left: -1ch;
+    background:
+      linear-gradient(red, red) 1ch 0 / 4ch 1ch no-repeat,
+      linear-gradient(green, green) 1ch 0 / 4ch 4ch no-repeat;
+
+    text-align: right;
+    white-space: normal;
+  }
+  span {
+    color: transparent;
+    background: green;
+  }
+  .break-spaces {
+    white-space: break-spaces;
+  }
+</style>
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div><span>X&#x3000;&#x3000;</span><span class="break-spaces"> </span></div>
+
+<!--
+  With white-space: normal, ideographic spaces (U+3000) are preserved but do
+  hang. But here they are followed by spaces with white-space: break-spaces,
+  which are preserved and never hang. Since only glyphs at the edge of a line
+  can hang, this prevents the ideographic spaces from hanging.
+-->