auto merge of #4865 : psdh/servo/prepscript, r=Ms2ger

#4176

components/script/dom/htmlscriptelement.rs

@@ -170,9 +170,25 @@ impl<'a> HTMLScriptElementHelpers for JSRef<'a, HTMLScriptElement> {
         // these steps at this point. The script is not executed.
 
         // Step 12.
-        // TODO: If the script element has an `event` attribute and a `for` attribute, then run
+        match element.get_attribute(ns!(""), &atom!("for")).root() {
-        // these substeps...
+            Some(for_script) => {
+                if for_script.r().Value().to_ascii_lowercase().trim_matches(HTML_SPACE_CHARACTERS) != "window" {
+                    return;
+                }
+            }
+            _ => { }
+        }
 
+        match element.get_attribute(ns!(""), &Atom::from_slice("event")).root() {
+            Some(event) => {
+                let event = event.r().Value().to_ascii_lowercase();
+                let event = event.trim_matches(HTML_SPACE_CHARACTERS);
+                if event != "onload" && event != "onload()" {
+                    return;
+                }
+            }
+            _ => { }
+        }
         // Step 13.
         // TODO: If the script element has a `charset` attribute, then let the script block's
         // character encoding for this script element be the result of getting an encoding from the

tests/wpt/metadata/html/semantics/scripting-1/the-script-element/script-for-event.html.ini

@@ -1,38 +0,0 @@
-[script-for-event.html]
-  type: testharness
-  [Script 0]
-    expected: FAIL
-
-  [Script 1]
-    expected: FAIL
-
-  [Script 2]
-    expected: FAIL
-
-  [Script 3]
-    expected: FAIL
-
-  [Script 4]
-    expected: FAIL
-
-  [Script 5]
-    expected: FAIL
-
-  [Script 6]
-    expected: FAIL
-
-  [Script 7]
-    expected: FAIL
-
-  [Script 8]
-    expected: FAIL
-
-  [Script 9]
-    expected: FAIL
-
-  [Script 10]
-    expected: FAIL
-
-  [Script 11]
-    expected: FAIL
-

tests/wpt/metadata/html/semantics/scripting-1/the-script-element/script-for-event.xhtml.ini

@@ -1,5 +0,0 @@
-[script-for-event.xhtml]
-  type: testharness
-  [Scripts with for and event attributes should not run.]
-    expected: FAIL
-

tests/wpt/metadata/html/semantics/scripting-1/the-script-element/script-for-onload.html.ini

@@ -1,5 +0,0 @@
-[script-for-onload.html]
-  type: testharness
-  [Script for and onload attributes]
-    expected: FAIL
-