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Add warnings to output for alpha levels in contrast check #223

Merged
merged 2 commits into from
Jul 5, 2018
Merged

Add warnings to output for alpha levels in contrast check #223

merged 2 commits into from
Jul 5, 2018

Commits on Jul 4, 2018

  1. Add methods to convert an rgba background color to rgb

    @mfairchild365 @phillbaker
    mfairchild365 authored and phillbaker committed Jul 4, 2018
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  2. Issue warnings for alpha in contrast checking. 

    Three complications with calculating the "flattened" (non-alpha) representation of font color and background color are:
* determining what is actually behind the text - elements may be positioned with css such that it's very hard to determine what element is the background of some or all of the text
* the css opacity element may introduce further aspects of transparency
* transparent background can reveal images where contrast cannot be calculated
    @phillbaker
    phillbaker committed Jul 4, 2018
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