[whatwg] Plus Signs in Signed Integers

Justin Lebar justin.lebar at gmail.com
Wed Jul 15 11:25:47 PDT 2009

> What does IE do in these two examples?

It appears that IE8 has the following behavior:

>>  <ol start=+4>

start = 4

>>  <ol start=H2SO4>

start = 1

Test at http://stanford.edu/~jlebar/moz/list.html


On Tue, Jul 14, 2009 at 12:43 AM, Jonas Sicking<jonas at sicking.cc> wrote:
> On Thu, Jun 18, 2009 at 9:33 AM, Smylers<Smylers at stripey.com> wrote:
>> It also doesn't seem to match browser behaviour: the <ol> element's
>> start attribute is an integer, so I tried this out in various browsers:
>>  <ol start=+4>
>>    <li>Plus four
>>  </ol>
>> All the ones I had to hand (Firefox, Opera, Konqueror, Dillo, Lynx,
>> Links, and W3M) numbered the element with "4".
> [snip]
>> To check that it is specifically the plus sign they are ignoring and not
>> any non-digit character I also tried:
>>  <ol start=H2SO4>
>>    <li>Acid test
>>  </ol>
>> That should cause parsing an integer to abort and so the default of
>> start=1 to be used.  Opera, Links, and W3M get that right.  Konqueror,
>> Dillo, and Lynx all also seem to manage the aborting, but use a default
>> of zero instead.  Firefox parses the "2" out of "H2SO4", seemingly using
>> the first integer it can find in the attribute, so possibly isn't
>> special-casing "+".
> What does IE do in these two examples? It appears webkit treats the
> first one as start=4 and the second as start=0.
> / Jonas

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