Fix redirects. (#29254)

site/content/docs/4.3/components/breadcrumb.md

@@ -32,7 +32,7 @@ group: components
 
 ## Changing the separator
 
-Separators are automatically added in CSS through [`::before`](https://developer.mozilla.org/en-US/docs/Web/CSS/::before) and [`content`](https://developer.mozilla.org/en-US/docs/Web/CSS/content). They can be changed by changing `$breadcrumb-divider`. The [quote](https://sass-lang.com/documentation/Sass/Script/Functions.html#quote-instance_method) function is needed to generate the quotes around a string, so if you want `>` as separator, you can use this:
+Separators are automatically added in CSS through [`::before`](https://developer.mozilla.org/en-US/docs/Web/CSS/::before) and [`content`](https://developer.mozilla.org/en-US/docs/Web/CSS/content). They can be changed by changing `$breadcrumb-divider`. The [quote](https://sass-lang.com/documentation/functions/string#quote) function is needed to generate the quotes around a string, so if you want `>` as separator, you can use this:
 
 ```scss
 $breadcrumb-divider: quote(">");

site/content/docs/4.3/getting-started/browsers-devices.md

@@ -123,7 +123,7 @@ As of iOS 9.2, while a modal is open, if the initial touch of a scroll gesture i
 
 ### Navbar Dropdowns
 
-The `.dropdown-backdrop` element isn't used on iOS in the nav because of the complexity of z-indexing. Thus, to close dropdowns in navbars, you must directly click the dropdown element (or [any other element which will fire a click event in iOS](https://developer.mozilla.org/en-US/docs/Web/Events/click#Safari_Mobile)).
+The `.dropdown-backdrop` element isn't used on iOS in the nav because of the complexity of z-indexing. Thus, to close dropdowns in navbars, you must directly click the dropdown element (or [any other element which will fire a click event in iOS](https://developer.mozilla.org/en-US/docs/Web/API/Element/click_event#Safari_Mobile)).
 
 ## Browser zooming
 

site/content/docs/4.3/getting-started/javascript.md

@@ -28,7 +28,7 @@ We provide a version of Bootstrap built as `ESM` (`bootstrap.esm.js` and `bootst
 {{< callout warning >}}
 ## Incompatible plugins
 
-Due to browser limitations, some of our plugins, namely Dropdown, Tooltip and Popover plugins, cannot be used in a `<script>` tag with `module` type because they depend on Popper.js. For more information about the issue see [here](https://developers.google.com/web/fundamentals/primers/modules#specifiers).
+Due to browser limitations, some of our plugins, namely Dropdown, Tooltip and Popover plugins, cannot be used in a `<script>` tag with `module` type because they depend on Popper.js. For more information about the issue see [here](https://v8.dev/features/modules#specifiers).
 {{< /callout >}}
 
 ## Dependencies

site/content/docs/4.3/getting-started/theming.md

@@ -362,7 +362,7 @@ Should you need to modify your `$grid-breakpoints`, your changes will apply to a
 
 ## CSS variables
 
-Bootstrap 4 includes around two dozen [CSS custom properties (variables)](https://developer.mozilla.org/en-US/docs/Web/CSS/Using_CSS_variables) in its compiled CSS. These provide easy access to commonly used values like our theme colors, breakpoints, and primary font stacks when working in your browser's Inspector, a code sandbox, or general prototyping.
+Bootstrap 4 includes around two dozen [CSS custom properties (variables)](https://developer.mozilla.org/en-US/docs/Web/CSS/Using_CSS_custom_properties) in its compiled CSS. These provide easy access to commonly used values like our theme colors, breakpoints, and primary font stacks when working in your browser's Inspector, a code sandbox, or general prototyping.
 
 ### Available variables
 

site/content/docs/4.3/utilities/api.md

@@ -7,7 +7,7 @@ aliases: "/docs/4.3/utilities/"
 toc: true
 ---
 
-The bootstrap utilities are generated with the utility API which can be used to change or extend Bootstraps utility classes. If you don't have any idea what sass maps are, you can consult the [official docs](https://sass-lang.com/documentation/file.SASS_REFERENCE.html#maps) to get started.
+The bootstrap utilities are generated with the utility API which can be used to change or extend Bootstraps utility classes. If you don't have any idea what Sass maps are, you can consult the [official docs](https://sass-lang.com/documentation/values/maps) to get started.
 
 The `$utilities` map contains all utilities and is later merged with your custom `$utilities` map if present. The utility map contains a keyed list of utility groups which accept the following options:
 

site/data/browser-features.yml

@@ -32,7 +32,7 @@
   browser: >
     Edge
   summary: >
-    Fire a [`transitioncancel` event](https://developer.mozilla.org/en-US/docs/Web/Events/transitioncancel) when a CSS transition is canceled
+    Fire a [`transitioncancel` event](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/transitioncancel_event) when a CSS transition is canceled
   upstream_bug: >
     UserVoice#15939898
   origin: >

site/data/icons.yml

@@ -10,7 +10,7 @@ more:
   - name: Bytesize
     website: https://github.com/danklammer/bytesize-icons
   - name: Google Material icons
-    website: https://material.io/tools/icons/
+    website: https://material.io/resources/icons/
   - name: Ionicons
     website: https://ionicons.com/
   - name: Dripicons