fix: case-insensitive attribute checks in no-missing-link-fragment (#465)

fix: case-insensitive checks for HTML attributes in `no-missing-link-fragment`

Author: lumirlumir

src/rules/no-missing-link-fragments.js

@@ -28,7 +28,7 @@ import GithubSlugger from "github-slugger";
 const githubLineReferencePattern = /^L\d+(?:C\d+)?(?:-L\d+(?:C\d+)?)?$/u;
 const customHeadingIdPattern = /\{#([^}\s]+)\}\s*$/u;
 const htmlCommentPattern = /<!--[\s\S]*?-->/gu;
-const htmlIdNamePattern = /<(?:[^>]+)\s+(?:id|name)=["']([^"']+)["']/gu;
+const htmlIdNamePattern = /<(?:[^>]+)\s+(?:id|name)=["']([^"']+)["']/giu;
 
 /**
  * Checks if the fragment is a valid GitHub line reference

tests/rules/no-missing-link-fragments.test.js

@@ -43,12 +43,36 @@ ruleTester.run("no-missing-link-fragments", rule, {
 		[Link](#bookmark)
 		`,
 
+		// HTML anchor tags case-insensitive
+		dedent`
+		<a ID="bookmark"></a>
+		[Link](#bookmark)
+		`,
+
+		// HTML anchor tags case-insensitive
+		dedent`
+		<a Id="bookmark"></a>
+		[Link](#bookmark)
+		`,
+
 		// HTML name attribute
 		dedent`
 		<a name="old-style"></a>
 		[Link](#old-style)
 		`,
 
+		// HTML name attribute case-insensitive
+		dedent`
+		<a NAME="old-style"></a>
+		[Link](#old-style)
+		`,
+
+		// HTML name attribute case-insensitive
+		dedent`
+		<a NaMe="old-style"></a>
+		[Link](#old-style)
+		`,
+
 		dedent`
 		<h1 id="bookmark">Bookmark</h1>
 		<h1 name="old-style">Old Style</h1>