Invalidate and flush shadow tree stylesheets where needed

1 files changed, 12 insertions, 1 deletions

diff --git a/components/layout_thread/lib.rs b/components/layout_thread/lib.rs
index 839fac79006..8c46fb90720 100644
--- a/components/layout_thread/lib.rs
+++ b/components/layout_thread/lib.rs
@@ -103,7 +103,7 @@ use std::time::Duration;
 use style::animation::Animation;
 use style::context::{QuirksMode, RegisteredSpeculativePainter, RegisteredSpeculativePainters};
 use style::context::{SharedStyleContext, ThreadLocalStyleContextCreationInfo};
-use style::dom::{ShowSubtree, ShowSubtreeDataAndPrimaryValues, TElement, TNode};
+use style::dom::{ShowSubtree, ShowSubtreeDataAndPrimaryValues, TDocument, TElement, TNode};
 use style::driver;
 use style::error_reporting::RustLogReporter;
 use style::global_style_data::{GLOBAL_STYLE_DATA, STYLE_THREAD_POOL};
@@ -1346,6 +1346,17 @@ impl LayoutThread {
             }
         }
 
+        debug!(
+            "Shadow roots in document {:?}",
+            document.shadow_roots().len()
+        );
+
+        let device = Device::new(MediaType::screen(), initial_viewport, device_pixel_ratio);
+        // Flush shadow roots stylesheets if dirty.
+        for shadow_root in document.shadow_roots() {
+            shadow_root.flush_stylesheets(&device, document.quirks_mode(), guards.author.clone());
+        }
+
         let restyles = document.drain_pending_restyles();
         debug!("Draining restyles: {}", restyles.len());