diff --git a/site/_data/browser-features.yml b/site/_data/browser-features.yml
index 6c8701f689..303113da8a 100644
--- a/site/_data/browser-features.yml
+++ b/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: >
diff --git a/site/docs/4.3/components/breadcrumb.md b/site/docs/4.3/components/breadcrumb.md
index 0837e83633..cff6c50069 100644
--- a/site/docs/4.3/components/breadcrumb.md
+++ b/site/docs/4.3/components/breadcrumb.md
@@ -33,7 +33,7 @@ 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(">");
diff --git a/site/docs/4.3/getting-started/browsers-devices.md b/site/docs/4.3/getting-started/browsers-devices.md
index 078d9912d9..ac00288b31 100644
--- a/site/docs/4.3/getting-started/browsers-devices.md
+++ b/site/docs/4.3/getting-started/browsers-devices.md
@@ -135,7 +135,7 @@ 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
 
diff --git a/site/docs/4.3/getting-started/theming.md b/site/docs/4.3/getting-started/theming.md
index a73393a8af..f5c497c3a8 100644
--- a/site/docs/4.3/getting-started/theming.md
+++ b/site/docs/4.3/getting-started/theming.md
@@ -375,7 +375,7 @@ 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