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+++ b/layout/generic/test/test_selection_tripleclick.html
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+<!DOCTYPE>
+<title>Selection test</title>
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script src="/tests/SimpleTest/EventUtils.js"></script>
+<style>
+  body { margin: 0; font: 16px/1 sans-serif; }
+  code { display: inline-block }
+</style>
+<p id="a">Some <code>code</code> with <span>text</span> with <code>code</code> in it</p>
+
+<p id="b">Here's <span>some</span> <code><span>code</span><br><span>broken</span></code> with <span>text</span> with <code><span>code</span><br><span>broken</span></code> in <span>it and such</span> and so on</p>
+
+<pre id="c">Here's some text and
+some <span>more</span> code <span>with</span> pre-formatted
+whitespace <span>that</span> should be selected
+line <span>by</span> line</pre>
+
+<script>
+  SimpleTest.waitForExplicitFinish();
+
+  function testTripleClick(elem, expectation) {
+    window.getSelection().removeAllRanges();
+    synthesizeMouse(elem, 5, 5, { clickCount: 3 });
+    is(window.getSelection().toString(), expectation);
+  }
+
+  SimpleTest.waitForFocus(function () {
+    for (let child of document.querySelectorAll("#a span, #a code"))
+      testTripleClick(child, "Some code with text with code in it");
+
+    {
+      let spans = document.querySelectorAll("#b span");
+      let expectations = [
+        "Here's some code", // First span, at the beginning of the text.
+        "Here's some code", // Top span in the inline-block, before break.
+        "broken with text with code", // Bottom span in inline-block, after break
+        "broken with text with code", // Center of the text.
+        "broken with text with code", // Top span in the second inline-block, before break.
+        "broken in it and such and so on", // Bottom span in the second inline-block, after break.
+        "broken in it and such and so on", // Last span, at the end of the text.
+      ];
+      is(spans.length, expectations.length);
+      for (let i = 0; i < expectations.length; ++i)
+        testTripleClick(spans[i], expectations[i]);
+    }
+
+    {
+      testTripleClick(document.getElementById("c"), "Here's some text and");
+      let spans = document.querySelectorAll("#c span");
+      let expectations = [
+        "some more code with pre-formatted",
+        "some more code with pre-formatted",
+        "whitespace that should be selected",
+        "line by line",
+      ];
+      is(spans.length, expectations.length);
+      for (let i = 0; i < expectations.length; ++i)
+        testTripleClick(spans[i], expectations[i]);
+    }
+
+    SimpleTest.finish();
+  });
+</script>