Add rel to list of sorted attributes (#1579)

Author: coliff

dist/core/rules/attr-sorted.js

@@ -466,6 +466,7 @@
 	            'src',
 	            'for',
 	            'type',
+	            'rel',
 	            'href',
 	            'value',
 	            'title',

dist/htmlhint.js

@@ -12,6 +12,7 @@ export default {
       'src',
       'for',
       'type',
+      'rel',
       'href',
       'value',
       'title',

dist/htmlhint.min.js

@@ -43,4 +43,18 @@ describe(`Rules: ${ruleId}`, () => {
     expect(messages[0].rule.id).toBe(ruleId)
     expect(messages[0].message).toContain('["type","img","id","font"]')
   })
+
+  it('link tag with rel before href should not throw error', () => {
+    const code = '<link rel="stylesheet" href="https://example.com/style.css">'
+    const messages = HTMLHint.verify(code, ruleOptions)
+    expect(messages.length).toBe(0)
+  })
+
+  it('link tag with href before rel should throw error', () => {
+    const code = '<link href="https://example.com/style.css" rel="stylesheet">'
+    const messages = HTMLHint.verify(code, ruleOptions)
+    expect(messages.length).toBe(1)
+    expect(messages[0].rule.id).toBe(ruleId)
+    expect(messages[0].message).toContain('["href","rel"]')
+  })
 })