- From: L. David Baron <dbaron@dbaron.org>
- Date: Wed, 19 Nov 2014 17:52:34 -0800
- To: "Tab Atkins Jr." <jackalmage@gmail.com>
- Cc: www-style list <www-style@w3.org>
- Message-ID: <20141120015234.GA10784@crum.dbaron.org>
On Wednesday 2014-11-19 12:28 -0800, Tab Atkins Jr. wrote: > In the telcon today, dbaron expressed concern that the definition of > <urange> requires looking at the "representation" of <number-token>s > and <dimension-token>s. (The "representation" of a numeric token is > the actual text used to write the number, including leading 0s, > leading + sign, original base and exponent when using scientific > notation, etc.) > > I pointed out that storing the representation of numeric tokens is > already required, in order to implement the <quirky-color> production > from the Quirks Mode spec > <https://quirks.spec.whatwg.org/#the-hashless-hex-color-quirk>. IE's > behavior distinguishes between "color: 123;" and "color: 000123;", but > FF/WK/Blink don't; both are treated as #000123, so we can maybe change > the Quirks Mode spec to not require the representation. > > So, that leaves us with three possible resolutions to the <urange> thing. > > 1. Leave it as it is. This requires storing the representation on > every numeric token, which is a memory cost, but it lets us parse > <urange> precisely. (The cost might not be as bad as all that. If > you only store the representation when it's "non-obvious" (leading + > sign, leading 0, scinot) then the memory cost is *most* of the time > just a single null pointer per numeric token. You can regenerate the > representation on the fly from "obvious" forms, so a helper function > can be used to make representation-retrieval easy when it's > necessary.) I'm ok with this, and I think I prefer it at this point. -David -- 𝄞 L. David Baron http://dbaron.org/ 𝄂 𝄢 Mozilla https://www.mozilla.org/ 𝄂 Before I built a wall I'd ask to know What I was walling in or walling out, And to whom I was like to give offense. - Robert Frost, Mending Wall (1914)
Received on Thursday, 20 November 2014 01:53:01 UTC