[wp-trac] [WordPress Trac] #23513: Twenty Thirteen: color contrast should aim for WCAG2 level AA compliance (was: Twenty Thirteen: color contrast should aim for 4.5:1)

[WordPress Trac]

#23513: Twenty Thirteen: color contrast should aim for WCAG2 level AA compliance
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 Reporter:  jorbin         |       Owner:
     Type:  defect (bug)   |      Status:  new
 Priority:  normal         |   Milestone:  3.6
Component:  Bundled Theme  |     Version:
 Severity:  normal         |  Resolution:
 Keywords:  has-patch      |
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Description changed by sabreuse:

Old description:

> With a more complex color palette than the previous black (or gray) on
> white default themes, we will have to check contrast ratios more
> carefully, with a goal of 4.5:1 as recommended by WCAG 2.0 accessibility
> guidelines. For example:
>
> The contrast between the beige and orange is a bit low.  The ratio is
> currently 3.2:1 with f94a0a being the orange,  If we switch to CA3C08,
> then we can bump the ratio to 4.6:1.
>
> Even against white (#fff), the ratio is only 3.5:1.
>
> Why is this important:
>
> [http://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-
> contrast.html]  explains why 4.5:1 is a minimum that we should aim for.
> Essentially it greatly will increase the readabilty for people with low
> visual acuity (roughly people with 20/40 vision).
>
> http://leaverou.github.com/contrast-ratio/ was used to check the ratios.
>
> Since we're likely to have multiple contrast fixes, let's collect them
> all in this ticket.

New description:

 With a more complex color palette than the previous black (or gray) on
 white default themes, we will have to check contrast ratios more
 carefully, with a goal of 4.5:1 for body text, and 3:1 for large text, as
 recommended by WCAG 2.0 accessibility guidelines. For example:

 The contrast between the beige and orange is a bit low.  The ratio is
 currently 3.2:1 with f94a0a being the orange,  If we switch to CA3C08,
 then we can bump the ratio to 4.6:1.

 Even against white (#fff), the ratio is only 3.5:1.

 Why is this important:

 [http://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-
 contrast.html]  explains why 4.5:1 is a minimum that we should aim for.
 Essentially it greatly will increase the readabilty for people with low
 visual acuity (roughly people with 20/40 vision).

 http://leaverou.github.com/contrast-ratio/ was used to check the ratios.

 Since we're likely to have multiple contrast fixes, let's collect them all
 in this ticket.

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Ticket URL: <http://core.trac.wordpress.org/ticket/23513#comment:10>
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