implement missing steps from "prepare a script" algorithm

Fixes #4089

1 files changed, 10 insertions, 0 deletions

diff --git a/components/script/dom/document.rs b/components/script/dom/document.rs
index 6e5413ebdc8..9abb356345e 100644
--- a/components/script/dom/document.rs
+++ b/components/script/dom/document.rs
@@ -120,6 +120,9 @@ pub struct Document {
     focused: MutNullableJS<Element>,
     /// The script element that is currently executing.
     current_script: MutNullableJS<HTMLScriptElement>,
+    /// https://html.spec.whatwg.org/multipage/webappapis.html#concept-n-noscript
+    /// True if scripting is enabled for all scripts in this document
+    scripting_enabled: Cell<bool>,
 }
 
 impl DocumentDerived for EventTarget {
@@ -203,6 +206,7 @@ pub trait DocumentHelpers<'a> {
     fn find_fragment_node(self, fragid: DOMString) -> Option<Temporary<Element>>;
     fn set_ready_state(self, state: DocumentReadyState);
     fn get_focused_element(self) -> Option<Temporary<Element>>;
+    fn is_scripting_enabled(self) -> bool;
     fn begin_focus_transaction(self);
     fn request_focus(self, elem: JSRef<Element>);
     fn commit_focus_transaction(self);
@@ -389,6 +393,11 @@ impl<'a> DocumentHelpers<'a> for JSRef<'a, Document> {
         let _ = event.r().fire(target);
     }
 
+    /// Return whether scripting is enabled or not
+    fn is_scripting_enabled(self) -> bool {
+        self.scripting_enabled.get()
+    }
+
     /// Return the element that currently has focus.
     // https://dvcs.w3.org/hg/dom3events/raw-file/tip/html/DOM3-Events.html#events-focusevent-doc-focus
     fn get_focused_element(self) -> Option<Temporary<Element>> {
@@ -710,6 +719,7 @@ impl Document {
             possibly_focused: Default::default(),
             focused: Default::default(),
             current_script: Default::default(),
+            scripting_enabled: Cell::new(true),
         }
     }