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Quoting WCAG 2.2 "Success Criterion 1.4.3 Contrast (Minimum)" [1]: > The visual presentation of text and images of text has a contrast > ratio of at least 4.5:1, except for the following: > > Large Text > > Large-scale text and images of large-scale text have a contrast > ratio of at least 3:1; Regarding large text, the corresponding "Understanding SC 1.4.3" [2] clarifies: > Text that is larger and has wider character strokes is easier to read at > lower contrast. The contrast requirement for larger text is therefore > lower. This allows authors to use a wider range of color choices for > large text, which is helpful for design of pages, particularly titles. > 18 point text or 14 point bold text is judged to be large enough to > require a lower contrast ratio. Therefore, lower the text contrast requirement in Writer's accessibility check from 4.5 to 3.0 for text that is considered large according to that specification. Add a unit test with 2 test documents: * one that adheres to the requirements and would have triggered false positives without this change in place (sw/qa/core/accessibilitycheck/data/ContrastTestOK.odt) * one that doesn't adhere to the requirements and still fails the check, as it should (sw/qa/core/accessibilitycheck/data/ContrastTestFail.odt) [1] https://www.w3.org/TR/WCAG22/#contrast-minimum [2] https://www.w3.org/WAI/WCAG22/Understanding/contrast-minimum.html Change-Id: I398f72aa5bdcd77c42834632575d6465a5ecd586 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/178127 Reviewed-by: Michael Weghorn <m.weghorn@posteo.de> Tested-by: Jenkins Reviewed-by: Balazs Varga <balazs.varga.extern@allotropia.de> |
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