Removing style element's styles when elements is removed from dom

servo · bors-servo · Jan 24, 2017 · Jan 9, 2017 · Jan 9, 2017 · Jan 9, 2017
commit f0c72cb7fd5372220d40cc021867350cafd84fc7
diff --git a/components/script/dom/htmlstyleelement.rs b/components/script/dom/htmlstyleelement.rs
@@ -15,7 +15,7 @@ use dom::document::Document;
 use dom::element::{Element, ElementCreator};
 use dom::eventtarget::EventTarget;
 use dom::htmlelement::HTMLElement;
-use dom::node::{ChildrenMutation, Node, document_from_node, window_from_node};
+use dom::node::{ChildrenMutation, Node, UnbindContext, document_from_node, window_from_node};
 use dom::stylesheet::StyleSheet as DOMStyleSheet;
 use dom::virtualmethods::VirtualMethods;
 use html5ever_atoms::LocalName;
@@ -161,6 +161,15 @@ impl VirtualMethods for HTMLStyleElement {
             self.parse_own_css();
         }
     }
+
+    fn unbind_from_tree(&self, context: &UnbindContext) {
+        if let Some(ref s) = self.super_type() {
+            s.unbind_from_tree(context);
+        }
+
+        let doc = document_from_node(self);
+        doc.invalidate_stylesheets();
+    }
 }
 
 impl StylesheetOwner for HTMLStyleElement {

diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -6474,6 +6474,18 @@
             "url": "/_mozilla/mozilla/remove_link_styles.html"
           }
         ],
+        "mozilla/remove_style_styles.html": [
+          {
+            "path": "mozilla/remove_style_styles.html",
+            "references": [
+              [
+                "/_mozilla/mozilla/remove_style_styles_ref.html",
+                "=="
+              ]
+            ],
+            "url": "/_mozilla/mozilla/remove_style_styles.html"
+          }
+        ],
         "mozilla/reparse_style_elements.html": [
           {
             "path": "mozilla/reparse_style_elements.html",

           "url": "/_mozilla/mozilla/remove_link_styles.html"
         }
       ],
+      "mozilla/remove_style_styles.html": [
+        {
+          "path": "mozilla/remove_style_styles.html",
+          "references": [
+            [
+              "/_mozilla/mozilla/remove_style_styles_ref.html",
+              "=="
+            ]
+          ],
+          "url": "/_mozilla/mozilla/remove_style_styles.html"
+        }
+      ],
       "mozilla/reparse_style_elements.html": [
         {
           "path": "mozilla/reparse_style_elements.html",
diff --git a/tests/wpt/mozilla/tests/mozilla/remove_style_styles.html b/tests/wpt/mozilla/tests/mozilla/remove_style_styles.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<meta charset="utf-8">
+<title>Removing style element should remove all associated styles</title>
+<link rel="match" href="remove_style_styles_ref.html">
+<body>
+    <style>
+        body {
+            background-color: red;
+        }
+    </style>
+
+    This text should be black and the background should not be red.
+
+    <script>
+        // Force restyling
+        window.getComputedStyle(document.body);
+        var s = document.querySelector('style');
+        s.parentNode.removeChild(s);
+    </script>
+</body>
diff --git a/tests/wpt/mozilla/tests/mozilla/remove_style_styles_ref.html b/tests/wpt/mozilla/tests/mozilla/remove_style_styles_ref.html
@@ -0,0 +1,5 @@
+<!doctype html>
+<meta charset="utf-8">
+<body>
+    This text should be black and the background should not be red.
+</body>