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    <p>9000's comment is correct. The trick is having access to a <code>&lt;span&gt;</code> that you know will be rendered on a single line. You can do that by wrapping the first word of your block in a span with a specific <code>id</code>, you could also use the last word or some other single word; there are cases where a single word will cross lines but the first word should be safe.</p> <p>Once you have something that is only on one line you can compare its height to the height of the <code>&lt;span&gt;</code> that will get the tooltip. If the <code>&lt;span&gt;</code> that is getting the tooltip is taller than the single-line <code>&lt;span&gt;</code> then it has wrapped to multiple lines.</p> <p>Try this jsfiddle:</p> <blockquote> <p><a href="http://jsfiddle.net/ambiguous/JbMhZ/1/" rel="noreferrer">http://jsfiddle.net/ambiguous/JbMhZ/1/</a></p> </blockquote> <p>Adjust the size of the right panes until the red text wraps but the green text doesn't. Then hit <strong>Run</strong> in the toolbar at the top and it should say this at the bottom of the <em>Result</em> pane:</p> <pre><code>#has-break spans more than one line #no-break spans only one line </code></pre> <p>I'm not exactly proud of this hack but it should work.</p> <p>I'm left wondering if a better positioning algorithm for your tooltip would be a better idea. Maybe pull the mouse coordinates out of the hover event and use that to position the tooltip rather than positioning it based on the <code>&lt;span&gt;</code>.</p>
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    1. POJavascript: how can I tell if a <span> is broken over 2 lines?
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    1. COGood idea, you can also give all `span` elements same `line-height` then compare each span height to that value instead of creating "dummy" span. :)
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    2. CO@Shadow Wizard: Except that `line-height` and rendered height aren't the same thing, they're related but not in any nice clean way. This updated fiddle should demonstrate the problem: http://jsfiddle.net/ambiguous/JbMhZ/2/. My first thought was to compute the expected height of a single line `<span>` but I gave up on that, Javascript just doesn't offer clean access to all the metrics we need to compute the pixel size of a piece of text. Anything to do with rendered text pixel size or line wrapping is a mess of nonsense in CSS/HTML/JavaScript.
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    3. CO@mu interesting, I thought giving `line-height` will force that height on every line no matter what font is used. :/
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