- From: Jeanne Spellman <jspellman@spellmanconsulting.com>
- Date: Fri, 20 Dec 2019 15:23:05 -0500
- To: Silver Task Force <public-silver@w3.org>
- Message-ID: <50d017db-0138-e591-9e0b-378b1d51589e@spellmanconsulting.com>
== Summary == A spirited discussion of the new formulas for visual contrast and a table for interpreting them. It took the entire meeting. Highlights: * The math and pseudocode for are in the visual contrast <https://docs.google.com/document/d/1lmTpfgublIqRggMVbrwo55FMlyJo3Avp_TAvpuFttxI/edit#> draft. Only look at pages 1-7. Pages 8 and up are older versions being saved for the moment. The new formula is based on solid science of perception. It is not adapted for different monitors and ambient conditions, although it can be expanded to do that in the future if desired. * The font sizes are based on the CSS reference pixel. There was discussion of the need for the point equivalent for designers and tools that still use points. We agreed to provide both. While there was discussion of print, we aren't doing contrast for print in SIlver. * We discussed the table of Acceptable Results. While the table provides equivalencies to current WCAG for comfort, it turned out that those equivalencies generated a lot of discussion because it appears that we are making the requirements much tougher. This is deceptive because WCAG 4.5:1 values are not uniform across the visual spectrum. For example, darker colors may meet WCAG 4.5:1, but actually are perceived as being much lower, such as 3:1. The lighter colors are more equivalent to WCAG 4.5:1. * We discussed the 3 color problem which is part of the reason that WCAG used a lower 4.5:1. This is covered in the table as a separate category. The apparent change to 7:1 is only for blocks of text that are using a thin stroke font. Blocks of colors are not changing substantially, as are bold or large fonts. It's the width of the color that is important for contrast. * We agree that the document we want to use a narrow scope for the first draft and that the section of pseudocode is in good shape for the first draft. More help is needed to write Methods. There will be informal meetings happening over the holidays during the regular meeting times (not the Conformance meeting time), but there will be no formal meeting until 7 January. == Minutes == https://www.w3.org/2019/12/20-silver-minutes.html
Received on Friday, 20 December 2019 20:23:09 UTC