Auto merge of #25576 - pshaughn:menuelement, r=jdm

Implement HTMLMenuElement

<!-- Please describe your changes on the following line: -->
Per spec, "The menu element is simply a semantic alternative to ul to express an unordered list of commands (a "toolbar")." We already have the CSS for it in user-agent.css, and this gives us the interface object.

---
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- [X] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [X] These changes fix #24990

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- [X] There are tests for these changes

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1 files changed, 54 insertions, 0 deletions

diff --git a/components/script/dom/htmlmenuelement.rs b/components/script/dom/htmlmenuelement.rs
new file mode 100644
index 00000000000..b1b9955130c
--- /dev/null
+++ b/components/script/dom/htmlmenuelement.rs
@@ -0,0 +1,54 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::dom::bindings::codegen::Bindings::HTMLMenuElementBinding;
+use crate::dom::bindings::codegen::Bindings::HTMLMenuElementBinding::HTMLMenuElementMethods;
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::document::Document;
+use crate::dom::htmlelement::HTMLElement;
+use crate::dom::node::Node;
+use dom_struct::dom_struct;
+use html5ever::{LocalName, Prefix};
+
+#[dom_struct]
+pub struct HTMLMenuElement {
+    htmlelement: HTMLElement,
+}
+
+impl HTMLMenuElement {
+    fn new_inherited(
+        local_name: LocalName,
+        prefix: Option<Prefix>,
+        document: &Document,
+    ) -> HTMLMenuElement {
+        HTMLMenuElement {
+            htmlelement: HTMLElement::new_inherited(local_name, prefix, document),
+        }
+    }
+
+    #[allow(unrooted_must_root)]
+    pub fn new(
+        local_name: LocalName,
+        prefix: Option<Prefix>,
+        document: &Document,
+    ) -> DomRoot<HTMLMenuElement> {
+        Node::reflect_node(
+            Box::new(HTMLMenuElement::new_inherited(local_name, prefix, document)),
+            document,
+            HTMLMenuElementBinding::Wrap,
+        )
+    }
+}
+
+impl HTMLMenuElementMethods for HTMLMenuElement {
+    // spec just mandates that compact reflects the content attribute,
+    // with no other semantics. Layout could use it to
+    // change line spacing, but nothing requires it to do so.
+
+    // https://html.spec.whatwg.org/multipage/#dom-menu-compact
+    make_bool_setter!(SetCompact, "compact");
+
+    // https://html.spec.whatwg.org/multipage/#dom-menu-compact
+    make_bool_getter!(Compact, "compact");
+}