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    <p>I've done this in the past using jQuery. You can measure the size of a piece of text like this:</p> <pre><code>// txt is the text to measure, font is the full CSS font declaration, // e.g. "bold 12px Verdana" function measureText(txt, font) { var id = 'text-width-tester', $tag = $('#' + id); if (!$tag.length) { $tag = $('&lt;span id="' + id + '" style="display:none;font:' + font + ';"&gt;' + txt + '&lt;/span&gt;'); $('body').append($tag); } else { $tag.css({font:font}).html(txt); } return { width: $tag.width(), height: $tag.height() } } var size = measureText("spam", "bold 12px Verdana"); console.log(size.width + ' x ' + size.height); // 35 x 12.6 </code></pre> <p>In order to fit this to a given space, it's a little trickier - you need to separate out the <code>font-size</code> declaration and scale it appropriately. Depending on how you're doing things, this might be easiest if you break out the different parts of the <code>font</code> declaration. A resize function might look like this (again, obviously, this is jQuery-dependent):</p> <pre><code>function shrinkToFill(input, fontSize, fontWeight, fontFamily) { var $input = $(input), txt = $input.val(), maxWidth = $input.width() + 5, // add some padding font = fontWeight + " " + fontSize + "px " + fontFamily; // see how big the text is at the default size var textWidth = measureText(txt, font).width; if (textWidth &gt; maxWidth) { // if it's too big, calculate a new font size // the extra .9 here makes up for some over-measures fontSize = fontSize * maxWidth / textWidth * .9; font = fontWeight + " " + fontSize + "px " + fontFamily; // and set the style on the input $input.css({font:font}); } else { // in case the font size has been set small and // the text was then deleted $input.css({font:font}); } </code></pre> <p>You can see this in action here: <a href="http://jsfiddle.net/nrabinowitz/9BFQ8/5/" rel="noreferrer">http://jsfiddle.net/nrabinowitz/9BFQ8/5/</a></p> <p>Testing seems to show that this is a little jumpy, at least in Google Chrome, because only full-integer font sizes are used. You might be able to do better with a <code>em</code>-based font declaration, though this might be a little tricky - you'd need to ensure that the <code>1em</code> size for the text width tester is the same as that for the input.</p>
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    1. COReally, no love at all for a fully functional and relatively clear example of the exact thing you were interested in?
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    2. COno, it's not that at all. it's perfect thanks. I got caught up in legal issues (incorporation, trademark, ToS and PP) and I haven't popped into SO in two days. Sorry about the delay in upvote and marking this as answered.
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    3. COThanks! Sorry if I was being petulant - I appreciate your consideration.
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