accessibility-checker-engine
Version:
An automated accessibility checking engine for use by other tools
93 lines (80 loc) • 4.95 kB
HTML
<html lang="en-US">
<head>
<title>text_contrast_sufficient - Accessibility Checker Help</title>
<script>
RULE_MESSAGES = {"en-US":{"group":"The contrast ratio of text with its background must meet WCAG AA requirements","pass":"The contrast ratio of text with its background meets WCAG AA requirements","fail_contrast":"Text contrast of {0} with its background is less than the WCAG AA minimum requirements for text of size {1}px and weight of {2}","potential_same_color":"The foreground text and its background color are both detected as {3}. Verify the text meets the WCAG AA requirements for minimum contrast","potential_graphic_background":"Verify the contrast ratio of the text against the lightest and the darkest colors of the background meets the WCAG AA minimum requirements for text of size {1}px and weight of {2}","potential_text_shadow":"Verify the contrast ratio of the text with shadow meets the WCAG AA minimum requirements for text of size {1}px and weight of {2}"}};
RULE_ID = "text_contrast_sufficient"
</script>
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<!-- Title and messages generated at build time -->
<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>
</head>
<body>
<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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<h3 id="ruleMessage"></h3>
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<div id="locLevel"></div>
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<p id="groupLabel"></p>
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<div class="bx--row">
<div class="bx--col-sm-4 bx--col-md-5 bx--col-lg-8 toolMain">
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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 larger text of 18 point 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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<div id="locSnippet"></div>
### What to do
* For large text that is at least 18 point or at least 14 point when bold, adjust the color of the text or its background to give at least a 3 to 1 contrast ratio
* **And**, for body text that is less than 18 point or less than 14 point when bold, adjust the color of the text or its background to give at least a 4.5 to 1 contrast ratio
</script></mark-down>
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<div id="ruleInfo"></div>
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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)
* [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 with visual impairment using color contrast enhancement
* People who cannot see color, have limited color vision, or have color blindness
</script></mark-down>
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