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Bug 12372 - Rules for parsing a legacy color value should strip whitespace
Summary: Rules for parsing a legacy color value should strip whitespace
Alias: None
Product: HTML WG
Classification: Unclassified
Component: LC1 HTML5 spec (show other bugs)
Version: unspecified
Hardware: All All
: P2 minor
Target Milestone: ---
Assignee: Ian 'Hixie' Hickson
QA Contact: HTML WG Bugzilla archive list
Depends on:
Reported: 2011-03-24 17:55 UTC by Aryeh Gregor
Modified: 2011-08-04 05:06 UTC (History)
4 users (show)

See Also:


Description Aryeh Gregor 2011-03-24 17:55:02 UTC
Consider the legacy color value " #fff".  The spec doesn't strip the whitespace from input, only from keyword, so it fails to remove the leading space and doesn't treat the # specially.  Then it replaces all non-hex characters by "0", so it gets "00fff".  Then it's not a multiple of three, so it pads to "00fff0".  This translates to #00fff0, a.k.a. rgb(0, 255, 240).  Likewise, " fff" becomes "0fff00".  Test case:

<!doctype html>
<font color=" #fff">Test</font>
<font color="#fff">Test</font>
<font color=" fff">Test</font>
<font color="fff">Test</font>
<script>document.body.textContent =
+ getComputedStyle(document.querySelectorAll("font")[1]).color
+ getComputedStyle(document.querySelectorAll("font")[2]).color
+ getComputedStyle(document.querySelectorAll("font")[3]).color;</script>

Spec:          #00fff0#ffffff#0fff00#0f0f0f
IE 9 RC:       #0f0f0f#0f0f0f#0f0f0f#0f0f0f
Firefox 4 RC:  #ffffff#ffffff#0f0f0f#0f0f0f
Chrome 11 dev: #ffffff#ffffff#ffffff#ffffff
Opera 11:      #0fff00#0f0f0f#0f0f0f#0f0f0f

(I've translated rgb() syntax to hex for easier interpretation.)  If the spec stripped whitespace, it would be:


which exactly matches Gecko.  The current spec doesn't match any browser for the leading-whitespace cases, while this change would make it match two or three browsers respectively.
Comment 1 Ian 'Hixie' Hickson 2011-05-08 00:39:18 UTC
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Status: Accepted
Change Description: see diff given below
Rationale: Concurred with reporter's comments.
Comment 2 contributor 2011-05-08 00:39:43 UTC
Checked in as WHATWG revision r6123.
Check-in comment: Looks like whitespace stripping needs to happen to non-keywords too.
Comment 3 Ian 'Hixie' Hickson 2011-05-08 00:40:06 UTC
BTW, see bug 9847 and r5359 for history.
Comment 4 Michael[tm] Smith 2011-08-04 05:06:23 UTC
mass-moved component to LC1