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    <p>Effectively, the trick is how to make the height of the pointy parts match the height of the menu item it follows, thus avoiding the jagged look.</p> <p>I am guessing that something like this causes the problem:</p> <ul> <li>Calculated menu item height is 5 physical screen pixels</li> <li>Each of the top and bottom borders that produce the arrow must be 50% of 5</li> <li>Since you cannot display a half pixel, both round off, say to 3 pixels</li> <li>Add together and the arrow becomes 6 pixels tall but menu item is only 5</li> </ul> <p>It seems clear then that the fix is to simply hide the overflow as stated. The only change really necessary to the original is:</p> <pre><code>ul.chevronbar { ... overflow: hidden; /* Add this line */ } </code></pre> <p>It would also need resizing to get closer to the original look, but works without that. Fixed height is not actually necessary.</p> <p>This simplified example illustrates the arrow concept with highlighting for parts of the arrow:</p> <pre><code>&lt;head&gt;&lt;style type="text/css"&gt; ul { background-color: lightgray; font-size: xx-large; overflow: hidden; position: relative; } li { display: inline-block; background-color: gray; margin-right: 1.5em; } li:after { content: ''; border: 0.85em solid blue; border-left-color: red; border-right-color: red; height: 0; position: absolute; top: -0.2em; } &lt;/style&gt;&lt;/head&gt; &lt;body&gt;&lt;ul&gt; &lt;li&gt;Lorem Ipsum&lt;/li&gt; &lt;li&gt;Foobar&lt;/li&gt; &lt;/ul&gt;&lt;/body&gt; </code></pre>
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    1. COWow, thanks so much. That description allowed me to solve the problem. The only change I had to make to get good behavior in both browsers was to make the :after element have a border size in pixels rather than em. (Plus, I had to adjust the vertical placement, but that was simple as well.)
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