- From: Simon Pieters <simonp@opera.com>
- Date: Fri, 27 Feb 2015 10:25:17 +0100
- To: www-style@w3.org
The CSSOM View spec uses `double` in ScrollToOptions top/left dictionary
members, which means that non-finite numbers throw TypeError per WebIDL.
http://dev.w3.org/csswg/cssom-view/#dictdef-scrolltooptions
The spec uses `unrestricted double` (and converts non-finite numbers to
zero) for the arguments that were traditionally `long`, since it matches
the traditional `long` behavior.
Example: scrollTo(0, NaN); // same as x.scrollTo(0, 0);
The ScrollToOptions dictionary is new so there is no Web compat to worry
about.
Example: scrollTo({top: NaN}); // throws TypeError per spec
However, in Gecko and Blink they are implemented as `unrestricted double`;
non-finite numbers do not throw TypeError. (Blink doesn't convert Infinity
to zero, this is a known bug.) Should we change the spec to make
ScrollToOptions top/left `unrestricted double`, so that the dictionary
behaves more like the old arguments? Or do people think it is more useful
to throw for non-finite numbers in the dictionary?
--
Simon Pieters
Opera Software
Received on Friday, 27 February 2015 09:25:43 UTC