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Re: CSS Transparent Background and 1.4.3?

for

From: Jonathan Avila
Date: Jan 24, 2017 11:47AM

> - users *may* have specified that their browser should use specific custom default colours. For this reason, not specifying at least an explicit colour for the body/html elements in addition to a foreground colour would lead to the explicitly defined foreground colour being displayed over any kind of colour - making this impossible to test for conclusively since it will depend on the user's settings (unless your evaluation explicitly mentions that the result is only valid for default browser values).

This is why we have F24: Failure of Success Criterion 1.4.3, 1.4.6 and 1.4.8 due to specifying foreground colors without specifying background colors or vice versa (https://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-contrast.html)

Jonathan

Jonathan Avila
Chief Accessibility Officer
SSB BART Group 
<EMAIL REMOVED>
703.637.8957 (Office)

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