feat(script): add `Supports()` to `htmlscriptelement` (#37313)

Add static method `Supports` to `HTMLScriptElement`.

Part of #37262
Testing: relative WPT tests should become `PASS`

Signed-off-by: Jason Tsai <git@pews.dev>

2 files changed, 10 insertions, 0 deletions

diff --git a/components/script/dom/htmlscriptelement.rs b/components/script/dom/htmlscriptelement.rs
index 421ff11d189..b3005b181da 100644
--- a/components/script/dom/htmlscriptelement.rs
+++ b/components/script/dom/htmlscriptelement.rs
@@ -70,6 +70,7 @@ use crate::dom::performanceresourcetiming::InitiatorType;
 use crate::dom::trustedscript::TrustedScript;
 use crate::dom::trustedscripturl::TrustedScriptURL;
 use crate::dom::virtualmethods::VirtualMethods;
+use crate::dom::window::Window;
 use crate::fetch::create_a_potential_cors_request;
 use crate::network_listener::{self, NetworkListener, PreInvoke, ResourceTimingListener};
 use crate::realms::enter_realm;
@@ -1526,6 +1527,13 @@ impl HTMLScriptElementMethods<crate::DomTypeHolder> for HTMLScriptElement {
             .SetTextContent(Some(DOMString::from(value)), can_gc);
         Ok(())
     }
+
+    /// <https://html.spec.whatwg.org/multipage/#dom-script-supports>
+    fn Supports(_window: &Window, type_: DOMString) -> bool {
+        // The type argument has to exactly match these values,
+        // we do not perform an ASCII case-insensitive match.
+        matches!(type_.str(), "classic" | "module" | "importmap")
+    }
 }
 
 #[derive(Clone, Copy)]
diff --git a/components/script_bindings/webidls/HTMLScriptElement.webidl b/components/script_bindings/webidls/HTMLScriptElement.webidl
index 2c7b398b7e3..a21ae6007c4 100644
--- a/components/script_bindings/webidls/HTMLScriptElement.webidl
+++ b/components/script_bindings/webidls/HTMLScriptElement.webidl
@@ -32,6 +32,8 @@ interface HTMLScriptElement : HTMLElement {
   [CEReactions]
            attribute DOMString referrerPolicy;
 
+  static boolean supports(DOMString type);
+
   // also has obsolete members
 };