dur attribute should permit leading .

[longsonr]

https://svgwg.org/specs/animations/#ClockValueSyntax

dur=".5s" is invalid per the specification. Chrome allows it, Firefox does not. I propose that it be allowed.

So we'd change to this...

Timecount ::= DIGIT*

[AmeliaBR]

For usability & consistency with other parts of SVG, I'd definitely like to support making the leading zero optional. (Although the grammar fix might need to be a little more complicated than you suggest, as it makes all parts of a "timecount" value optional.)

That said, this syntax was defined for compatibility with SMIL, exactly duplicating their syntax. I'm not sure whether or not that's still relevant now, but it makes spec'ing a change more complicated.

[longsonr]

We could do this instead

Timecount-val ::= (Timecount ("." Fraction)? (Metric)?) | ("." Fraction (Metric)?)

[css-meeting-bot]

The Working Group just discussed dur attribute should permit leading.

The full IRC log of that discussion

<krit> topic: dur attribute should permit leading
<liam> github issue: https://github.com//issues/394
<krit> liam: AmeliaBR points out that SMIL doesn't support the dot
<krit> AmeliaBR: can we redefine it in SVG with a new syntax or do we continue to align with SMIL? This is not in SVG 2.0 anymore.
<krit> krit: suggest to leave issue for later.
<krit> AmeliaBR: we should discuss number issues in general first. (differences between CSS and SVG)

[boggydigital]

Not blocking updated 2.0 CR publication - assigning 2.1 WD milestone

[longsonr]

Note begin and any other SMIL attributes that use clock-time are also affected.

[longsonr]

From version 115, Firefox will accept dur/begin/end that starts with a decimal point.