[whatwg] <marquee> feedback
ian at hixie.ch
Thu Apr 28 12:17:45 PDT 2011
On Tue, 7 Dec 2010, Andy Estes wrote:
> I recently implemented HTML5's IDL definition for <marquee> in WebKit
> (https://webkit.org/b/49786) and noticed a few differences between how
> HTML5 specs marquee and how IE implements it. I noticed the following
> two discrepancies:
> 1) For scrollAmount, scrollDelay and loop, IE does not allow the content
> attribute value to contain trailing non-numeric characters, although
> such characters are allowed according to HTML5's "rules for parsing
> non-negative integers" (section 18.104.22.168). IE will return the default
> value for these attributes if non-numeric characters are encountered,
> but HTML5 says to parse up to the first non-number and return that
> 2) For scrollAmount, scrollDelay and loop, if a value is specified that
> exceeds 2^31-1, IE will return 2^31-1. HTML5 says that for reflected
> unsigned longs, if a value is larger than 2^31-1, the default value, or
> 0, should be returned (section 2.8.1).
> Perhaps these differences aren't specific to <marquee> but rather true
> for all unsigned content attributes in IE. In any event, I wanted to
> point out the differences in these edge cases and ask if they are
> intentional or not. I'd be happy to file a bug if that's the correct
> thing to do.
On Tue, 7 Dec 2010, Jonas Sicking wrote:
> Unless this breaks websites, it seems like a good thing to have
> consistent parsing across multiple attributes. Both for implementors and
This is an area where there is a surprisingly low level of
interoperability amongst the browsers near edge cases. The current spec
text is the result of careful examination of a number of attributes, and
is an attempt to try to be as consistent across attributes as possible.
So I haven't changed marquee for this.
If there are compat issues with existing sites, please do reraise this, as
this would change the equation significantly.
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
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