accessibility-checker-engine
Version:
An automated accessibility checking engine for use by other tools
91 lines (77 loc) • 4.06 kB
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<link rel="icon" href="https://ibm.com/able/favicon-32x32.png" type="image/png">
<link rel="icon" href="https://ibm.com/able/favicon.svg" type="image/svg+xml">
<link rel="stylesheet" href="../common/help.css" />
<script type="module">
import "https://1.www.s81c.com/common/carbon/web-components/version/v1.35.0/code-snippet.min.js";
import "https://1.www.s81c.com/common/carbon/web-components/version/v1.35.0/list.min.js";
</script>
<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
<script src="../common/help.js"></script>
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<div class="bx--grid toolHelp">
<div class="bx--row">
<div class="bx--col-sm-4 bx--col-md-8 bx--col-lg-16 toolHead">
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<mark-down><script type="text/plain">
### Why is this important?
When text and its background colors have less than a 4.5 to 1 contrast ratio, it can be difficult for people with moderately low vision to read the text without contrast-enhancing technology.
For the larger text of 18 points or more or bold 14 point text, the text and background colors must give at least a 3 to 1 contrast ratio.
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### What to do
Adjust the colors:
* Text should have a solid background (i.e., not a color gradient or a background image) where possible.
* **Or**, when that is not possible (which is rare), manually check the contrast ratio of the text against the lightest and the darkest colors of the background with the [Color Contrast Analyzer](https://www.ibm.com/able/toolkit/verify/manual/#color). For regular text, it must be at least 4.5 to 1. For large text at least 18 point or at least 14 point when bold, the contrast ratio must be at least 3 to 1.
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<div class="bx--col-sm-4 bx--col-md-3 bx--col-lg-4 toolSide">
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<mark-down><script type="text/plain">
### About this requirement
* [IBM 1.4.3 Contrast (Minimum)](https://www.ibm.com/able/requirements/requirements/#1_4_3)
### WCAG techniques
* [G18: Regular text contrast ratio of at least 4.5:1](https://www.w3.org/WAI/WCAG22/Techniques/general/G18)
* [G145: Large text contrast ratio of at least 3:1](https://www.w3.org/WAI/WCAG22/Techniques/general/G145)
### Who does this affect?
* People with moderately low vision who do not use a contrast-enhancing technology
* People who do not see the full range of colors
* People who see no color
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