Breadcrumb docs: Add MDN CSS doc links

diff --git a/docs/components/breadcrumb.md b/docs/components/breadcrumb.md
index 8dd4fb27ccc39ae086db3bbde206d2fb7407c31b..bfd7ef1b611e04b7c695f0f0895ce61033c20b81 100644 (file)
--- a/docs/components/breadcrumb.md
+++ b/docs/components/breadcrumb.md
@@ -6,7 +6,7 @@ group: components
 
 Indicate the current page's location within a navigational hierarchy.
 
-Separators are automatically added in CSS through `:before` and `content`.
+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).
 
 {% example html %}
 <ol class="breadcrumb">