Update links to CCA, MQ5 prefers-reduced-motion, evergreen WCAG urls (#…

…33797)

site/content/docs/5.0/getting-started/accessibility.md

@@ -10,7 +10,7 @@ Bootstrap provides an easy-to-use framework of ready-made styles, layout tools,
 
 ## Overview and limitations
 
-The overall accessibility of any project built with Bootstrap depends in large part on the author's markup, additional styling, and scripting they've included. However, provided that these have been implemented correctly, it should be perfectly possible to create websites and applications with Bootstrap that fulfill [<abbr title="Web Content Accessibility Guidelines">WCAG</abbr> 2.1](https://www.w3.org/TR/WCAG21/) (A/AA/AAA), [Section 508](https://www.section508.gov/), and similar accessibility standards and requirements.
+The overall accessibility of any project built with Bootstrap depends in large part on the author's markup, additional styling, and scripting they've included. However, provided that these have been implemented correctly, it should be perfectly possible to create websites and applications with Bootstrap that fulfill [<abbr title="Web Content Accessibility Guidelines">WCAG</abbr> 2.1](https://www.w3.org/TR/WCAG/) (A/AA/AAA), [Section 508](https://www.section508.gov/), and similar accessibility standards and requirements.
 
 ### Structural markup
 
@@ -24,7 +24,7 @@ Because Bootstrap's components are purposely designed to be fairly generic, auth
 
 ### Color contrast
 
-Some combinations of colors that currently make up Bootstrap's default palette—used throughout the framework for things such as button variations, alert variations, form validation indicators—may lead to *insufficient* color contrast (below the recommended [WCAG 2.1 text color contrast ratio of 4.5:1](https://www.w3.org/TR/WCAG21/#contrast-minimum) and the [WCAG 2.1 non-text color contrast ratio of 3:1](https://www.w3.org/TR/WCAG21/#non-text-contrast)), particularly when used against a light background. Authors are encouraged to test their specific uses of color and, where necessary, manually modify/extend these default colors to ensure adequate color contrast ratios.
+Some combinations of colors that currently make up Bootstrap's default palette—used throughout the framework for things such as button variations, alert variations, form validation indicators—may lead to *insufficient* color contrast (below the recommended [WCAG 2.1 text color contrast ratio of 4.5:1](https://www.w3.org/TR/WCAG/#contrast-minimum) and the [WCAG 2.1 non-text color contrast ratio of 3:1](https://www.w3.org/TR/WCAG/#non-text-contrast)), particularly when used against a light background. Authors are encouraged to test their specific uses of color and, where necessary, manually modify/extend these default colors to ensure adequate color contrast ratios.
 
 ### Visually hidden content
 
@@ -45,17 +45,17 @@ For visually hidden interactive controls, such as traditional "skip" links, use
 
 ### Reduced motion
 
-Bootstrap includes support for the [`prefers-reduced-motion` media feature](https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion). In browsers/environments that allow the user to specify their preference for reduced motion, most CSS transition effects in Bootstrap (for instance, when a modal dialog is opened or closed, or the sliding animation in carousels) will be disabled, and meaningful animations (such as spinners) will be slowed down.
+Bootstrap includes support for the [`prefers-reduced-motion` media feature](https://www.w3.org/TR/mediaqueries-5/#prefers-reduced-motion). In browsers/environments that allow the user to specify their preference for reduced motion, most CSS transition effects in Bootstrap (for instance, when a modal dialog is opened or closed, or the sliding animation in carousels) will be disabled, and meaningful animations (such as spinners) will be slowed down.
 
 On browsers that support `prefers-reduced-motion`, and where the user has *not* explicitly signaled that they'd prefer reduced motion (i.e. where `prefers-reduced-motion: no-preference`), Bootstrap enables smooth scrolling using the `scroll-behavior` property.
 
 ## Additional resources
 
-- [Web Content Accessibility Guidelines (WCAG) 2.1](https://www.w3.org/TR/WCAG21/)
+- [Web Content Accessibility Guidelines (WCAG) 2.1](https://www.w3.org/TR/WCAG/)
 - [The A11Y Project](https://www.a11yproject.com/)
 - [MDN accessibility documentation](https://developer.mozilla.org/en-US/docs/Web/Accessibility)
 - [Tenon.io Accessibility Checker](https://tenon.io/)
-- [Color Contrast Analyser (CCA)](https://developer.paciellogroup.com/resources/contrastanalyser/)
+- [Color Contrast Analyser (CCA)](https://www.tpgi.com/color-contrast-checker/)
 - ["HTML Codesniffer" bookmarklet for identifying accessibility issues](https://github.com/squizlabs/HTML_CodeSniffer)
 - [Microsoft Accessibility Insights](https://accessibilityinsights.io/)
 - [Deque Axe testing tools](https://www.deque.com/axe/)