Auto merge of #26398 - Eijebong:fast-path-set-inner-html, r=jdm

Add a fast path in Element::SetInnerHTML when the value is small and trivial text

Inspired from gecko which has a similar fast path. This makes innerHTML
more than 10 times faster for this case.

Fixes #25892

1 files changed, 6 insertions, 2 deletions

diff --git a/components/script/dom/htmlhtmlelement.rs b/components/script/dom/htmlhtmlelement.rs
index 05b34dec3dc..da77d3464d9 100644
--- a/components/script/dom/htmlhtmlelement.rs
+++ b/components/script/dom/htmlhtmlelement.rs
@@ -2,6 +2,7 @@
  * 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::inheritance::Castable;
 use crate::dom::bindings::root::DomRoot;
 use crate::dom::document::Document;
 use crate::dom::htmlelement::HTMLElement;
@@ -32,9 +33,12 @@ impl HTMLHtmlElement {
         prefix: Option<Prefix>,
         document: &Document,
     ) -> DomRoot<HTMLHtmlElement> {
-        Node::reflect_node(
+        let n = Node::reflect_node(
             Box::new(HTMLHtmlElement::new_inherited(localName, prefix, document)),
             document,
-        )
+        );
+
+        n.upcast::<Node>().set_weird_parser_insertion_mode();
+        n
     }
 }