Auto merge of #11035 - mrobinson:no-stacking-contexts-for-text-fragments, r=pcwalton

Do not create stacking contexts for text fragments

Without this change, each text fragment in a block that establishes a
stacking context will establish its own stacking context. This is
unnecessary and increases the amount of work done during display list
construction. This change should not change output, but should improve
performance.

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---
This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11035)
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41 files changed, 13 insertions, 113 deletions

diff --git a/components/layout/fragment.rs b/components/layout/fragment.rs
index 9868e141df1..1de7a6ee86f 100644
--- a/components/layout/fragment.rs
+++ b/components/layout/fragment.rs
@@ -2207,6 +2207,13 @@ impl Fragment {
 
     /// Returns true if this fragment establishes a new stacking context and false otherwise.
     pub fn establishes_stacking_context(&self) -> bool {
+        // Text fragments shouldn't create stacking contexts.
+        match self.specific {
+            SpecificFragmentInfo::ScannedText(_) |
+            SpecificFragmentInfo::UnscannedText(_) => return false,
+            _ => {}
+        }
+
         if self.flags.contains(HAS_LAYER) {
             return true
         }
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/css-transforms-3d-on-anonymous-block-001.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/css-transforms-3d-on-anonymous-block-001.htm.ini
index 59ea4059dbe..605b45575ea 100644
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/css-transforms-3d-on-anonymous-block-001.htm.ini
+++ b/tests/wpt/metadata-css/css-transforms-1_dev/html/css-transforms-3d-on-anonymous-block-001.htm.ini
@@ -1,3 +1,4 @@
 [css-transforms-3d-on-anonymous-block-001.htm]
   type: reftest
-  expected: FAIL
+  expected:
+    if os == "linux": FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-abspos-002.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/regions-transforms-019.htm.ini
index 77459841bd5..705f98cc30b 100644
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-abspos-002.htm.ini
+++ b/tests/wpt/metadata-css/css-transforms-1_dev/html/regions-transforms-019.htm.ini
@@ -1,3 +1,3 @@
-[transform-abspos-002.htm]
+[regions-transforms-019.htm]
   type: reftest
   expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-abspos-007.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-abspos-007.htm.ini
deleted file mode 100644
index 0d1a4c62cd7..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-abspos-007.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-abspos-007.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-applies-to-002.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-applies-to-002.htm.ini
deleted file mode 100644
index 772cf9743c1..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-applies-to-002.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-applies-to-002.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-001.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-001.htm.ini
deleted file mode 100644
index 37ed085b9cc..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-001.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-001.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-003.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-003.htm.ini
deleted file mode 100644
index f9371d449b5..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-003.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-003.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-004.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-004.htm.ini
deleted file mode 100644
index 48d3aeb0999..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-004.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-004.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-005.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-005.htm.ini
deleted file mode 100644
index 9d5a181a35e..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-005.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-005.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-006.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-006.htm.ini
deleted file mode 100644
index 7e989ce666e..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-006.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-006.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-007.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-007.htm.ini
deleted file mode 100644
index 94db9087128..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-007.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-007.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-008.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-008.htm.ini
deleted file mode 100644
index 05768ab4ad6..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-008.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-008.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-009.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-009.htm.ini
deleted file mode 100644
index f93df01a325..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-009.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-009.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-010.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-010.htm.ini
deleted file mode 100644
index daf44462efc..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-010.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-010.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-011.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-011.htm.ini
deleted file mode 100644
index 8180f6b82f3..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-011.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-011.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-012.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-012.htm.ini
deleted file mode 100644
index 0e69b17aace..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-012.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-012.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-013.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-013.htm.ini
deleted file mode 100644
index 036a91d280a..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-013.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-013.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-014.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-014.htm.ini
deleted file mode 100644
index 6526e48aa60..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-014.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-014.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-015.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-015.htm.ini
deleted file mode 100644
index 410a0fcd4f2..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-015.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-015.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-016.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-016.htm.ini
deleted file mode 100644
index 210c746e1d3..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-input-016.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-input-016.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-origin-003.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-origin-003.htm.ini
deleted file mode 100644
index 3b872de3437..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-origin-003.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-origin-003.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-origin-004.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-origin-004.htm.ini
deleted file mode 100644
index 4f3804595ed..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-origin-004.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-origin-004.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-origin-005.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-origin-005.htm.ini
deleted file mode 100644
index bf7894566e0..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-origin-005.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-origin-005.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-origin-006.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-origin-006.htm.ini
deleted file mode 100644
index ccb2d1684f1..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-origin-006.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-origin-006.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-propagate-inherit-boolean-001.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-propagate-inherit-boolean-001.htm.ini
deleted file mode 100644
index ab6b910c46a..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-propagate-inherit-boolean-001.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-propagate-inherit-boolean-001.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-transformable-inline-block.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-transformable-inline-block.htm.ini
new file mode 100644
index 00000000000..405256c2282
--- /dev/null
+++ b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-transformable-inline-block.htm.ini
@@ -0,0 +1,3 @@
+[transform-transformable-inline-block.htm]
+  type: reftest
+  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-001.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-001.htm.ini
deleted file mode 100644
index f637f9c15e4..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-001.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translate-001.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-002.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-002.htm.ini
deleted file mode 100644
index ec3ddd87d53..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-002.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translate-002.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-003.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-003.htm.ini
deleted file mode 100644
index d30862d31e1..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-003.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translate-003.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-004.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-004.htm.ini
deleted file mode 100644
index cf8cf6aa84b..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-004.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translate-004.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-005.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-005.htm.ini
deleted file mode 100644
index 2e618eadb6c..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translate-005.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translate-005.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-001.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-001.htm.ini
deleted file mode 100644
index 15c47b2a0ba..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-001.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translatex-001.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-002.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-002.htm.ini
deleted file mode 100644
index 8dacbce3916..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-002.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translatex-002.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-003.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-003.htm.ini
deleted file mode 100644
index 26844b670a8..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-003.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translatex-003.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-004.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-004.htm.ini
deleted file mode 100644
index f9c6d1489f5..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-004.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translatex-004.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-005.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-005.htm.ini
deleted file mode 100644
index fbd9d70ad06..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatex-005.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translatex-005.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-001.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-001.htm.ini
deleted file mode 100644
index 2f8d60a36b4..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-001.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translatey-001.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-002.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-002.htm.ini
deleted file mode 100644
index f04687453cb..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-002.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translatey-002.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-003.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-003.htm.ini
deleted file mode 100644
index edbffe30ec2..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-003.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translatey-003.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-004.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-004.htm.ini
deleted file mode 100644
index dcf577a7a9a..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-004.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translatey-004.htm]
-  type: reftest
-  expected: FAIL
diff --git a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-005.htm.ini b/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-005.htm.ini
deleted file mode 100644
index 8863865b02b..00000000000
--- a/tests/wpt/metadata-css/css-transforms-1_dev/html/transform-translatey-005.htm.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[transform-translatey-005.htm]
-  type: reftest
-  expected: FAIL