Open Bug 753662 Opened 8 years ago Updated 6 years ago
textarea has super-padding beyond box model
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:12.0) Gecko/20100101 Firefox/12.0 Build ID: 20120420145725 Steps to reproduce: If you style a textarea and div IDENTICALLY, the text in the textarea is off by a pixel and will wrap "two pixels earlier" than text in the div. View my test case: http://jsfiddle.net/alanhogan/TCckK/ I created a textarea and div and styled them identically, including metrics, font, line-height, etc. However you can see that the textarea text is rendered in a space that is 2px smaller than in the div. This is stupid. Actual results: Text is in a smaller space than allocated per the CSS box model. Expected results: The textarea's content should exactly overlap the div in the text case, since everything about it (padding, size, font, etc.) is exactly the same per CSS!
Screenshot of Firefox 12/OS X 10.7.4: http://cl.ly/1C2s3S1y1Q2T3X3Z0K42
Also please note that Webkit on Desktop does not exhibit this problem. Nor does IE9 reliably do so, though it does exhibit unpredictable sub-pixel discrepancies of this nature.
Component: Untriaged → Layout: Form Controls
Product: Firefox → Core
> since everything about it (padding, size, font, etc.) is exactly the same per CSS! Except textarea is a replaced element, and has internal spacing to keep the caret from becoming invisible.
Confirmed - I ran into the same problem while working on a component to calculate the (x, y) position of the caret in a text area (https://github.com/component/textarea-caret-position/issues/10#issuecomment-37786158). Here's an ever easier Fiddle that shows the bug: http://jsfiddle.net/dandv/mKbaD/ Please fix this, as it affects the ability to calculate the coordinates for autocomplete drop-down divs.
@Boris: How about displaying the internal spacing only when the padding left or right is zero? Here's a screenshot of the padding being artificially increased in Firefox: https://f.cloud.github.com/assets/33569/2433558/f88a2b5c-ad94-11e3-8590-b552818eb03c.png WebKit and IE don't exhibit the problem.
WebKit and IE have behavior here that can't be described in CSS. It's possible to do that; it just requires completely revamping how textarea's layout is implemented... All of this has been discussed at length in the past.
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