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-rw-r--r--components/script/dom/webidls/DOMTokenList.webidl4
1 files changed, 3 insertions, 1 deletions
diff --git a/components/script/dom/webidls/DOMTokenList.webidl b/components/script/dom/webidls/DOMTokenList.webidl
index 61a3bebff15..746bc8ac521 100644
--- a/components/script/dom/webidls/DOMTokenList.webidl
+++ b/components/script/dom/webidls/DOMTokenList.webidl
@@ -5,10 +5,12 @@
// https://dom.spec.whatwg.org/#domtokenlist
interface DOMTokenList {
+ [Pure]
readonly attribute unsigned long length;
+ [Pure]
getter DOMString? item(unsigned long index);
- [Throws]
+ [Pure, Throws]
boolean contains(DOMString token);
[Throws]
void add(DOMString... tokens);