Add microtask checkpoints on </script> and CE construct

1 files changed, 13 insertions, 0 deletions

diff --git a/components/script/dom/servoparser/mod.rs b/components/script/dom/servoparser/mod.rs
index 40f3da3c78e..1e172db35fd 100644
--- a/components/script/dom/servoparser/mod.rs
+++ b/components/script/dom/servoparser/mod.rs
@@ -558,6 +558,19 @@ impl ServoParser {
                 Err(script) => script,
             };
 
+            // https://html.spec.whatwg.org/multipage/#parsing-main-incdata
+            // branch "An end tag whose tag name is "script"
+            // The spec says to perform the microtask checkpoint before
+            // setting the insertion mode back from Text, but this is not
+            // possible with the way servo and html5ever currently
+            // relate to each other, and hopefully it is not observable.
+            if is_execution_stack_empty() {
+                self.document
+                    .window()
+                    .upcast::<GlobalScope>()
+                    .perform_a_microtask_checkpoint();
+            }
+
             let script_nesting_level = self.script_nesting_level.get();
 
             self.script_nesting_level.set(script_nesting_level + 1);