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, 14 insertions, 0 deletions

diff --git a/components/script/dom/node.rs b/components/script/dom/node.rs
index 4579890a03e..503cc589b50 100644
--- a/components/script/dom/node.rs
+++ b/components/script/dom/node.rs
@@ -196,6 +196,10 @@ bitflags! {
 
         /// Specifies whether this node's shadow-including root is a document.
         const IS_CONNECTED = 1 << 10;
+
+        /// Whether this node has a weird parser insertion mode. i.e whether setting innerHTML
+        /// needs extra work or not
+        const HAS_WEIRD_PARSER_INSERTION_MODE = 1 << 11;
     }
 }
 
@@ -554,6 +558,16 @@ impl Node {
         self.flags.get().contains(NodeFlags::IS_IN_SHADOW_TREE)
     }
 
+    pub fn has_weird_parser_insertion_mode(&self) -> bool {
+        self.flags
+            .get()
+            .contains(NodeFlags::HAS_WEIRD_PARSER_INSERTION_MODE)
+    }
+
+    pub fn set_weird_parser_insertion_mode(&self) {
+        self.set_flag(NodeFlags::HAS_WEIRD_PARSER_INSERTION_MODE, true)
+    }
+
     pub fn is_connected(&self) -> bool {
         self.flags.get().contains(NodeFlags::IS_CONNECTED)
     }