--- a/testing/web-platform/tests/css/selectors/focus-visible-001.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-001.html
@@ -6,17 +6,17 @@
   <link rel="author" title="Rob Dodson" href="robdodson@chromium.org" />
   <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
   <script src="/resources/testdriver.js"></script>
   <script src="/resources/testdriver-actions.js"></script>
   <script src="/resources/testdriver-vendor.js"></script>
   <style>
-    @supports not (selector(:focus-visible)) {
+    @supports not selector(:focus-visible) {
       :focus {
         outline: red solid 5px;
         background-color: red;
       }
     }
 
     :focus-visible {
       outline: green solid 5px;

--- a/testing/web-platform/tests/css/selectors/focus-visible-002.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-002.html
@@ -7,17 +7,17 @@
   <link rel="author" title="Alice Boxhall" href="aboxhall@chromium.org" />
   <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
   <script src="/resources/testdriver.js"></script>
   <script src="/resources/testdriver-actions.js"></script>
   <script src="/resources/testdriver-vendor.js"></script>
   <style>
-    @supports not (selector(:focus-visible)) {
+    @supports not selector(:focus-visible) {
       :focus {
         outline: red solid 5px;
         background-color: red;
       }
     }
 
     :focus-visible {
       outline: green solid 5px;

--- a/testing/web-platform/tests/css/selectors/focus-visible-003.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-003.html
@@ -6,17 +6,17 @@
   <link rel="author" title="Alice Boxhall" href="aboxhall@chromium.org" />
   <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
   <script src="/resources/testdriver.js"></script>
   <script src="/resources/testdriver-actions.js"></script>
   <script src="/resources/testdriver-vendor.js"></script>
   <style>
-    @supports not (selector(:focus-visible)) {
+    @supports not selector(:focus-visible) {
       :focus {
         outline: red solid 5px;
         background-color: red;
       }
     }
 
     :focus-visible {
       outline: red solid 5px;

--- a/testing/web-platform/tests/css/selectors/focus-visible-004.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-004.html
@@ -6,17 +6,17 @@
   <link rel="author" title="Alice Boxhall" href="aboxhall@chromium.org" />
   <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
   <script src="/resources/testdriver.js"></script>
   <script src="/resources/testdriver-actions.js"></script>
   <script src="/resources/testdriver-vendor.js"></script>
   <style>
-    @supports not (selector(:focus-visible)) {
+    @supports not selector(:focus-visible) {
       :focus {
         outline: red solid 5px;
         background-color: red;
       }
     }
 
     :focus-visible {
       outline: red solid 5px;

--- a/testing/web-platform/tests/css/selectors/focus-visible-005.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-005.html
@@ -5,17 +5,17 @@
   <title>CSS Test (Selectors): Programmatic focus causes :focus-visible to match</title>
   <link rel="author" title="Alice Boxhall" href="aboxhall@chromium.org" />
   <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
   <script src="/resources/testdriver.js"></script>
   <script src="/resources/testdriver-vendor.js"></script>
   <style>
-    @supports not (selector(:focus-visible)) {
+    @supports not selector(:focus-visible) {
       :focus {
         outline: red solid 5px;
         background-color: red;
       }
     }
 
     :focus-visible {
       outline: red solid 5px;

--- a/testing/web-platform/tests/css/selectors/focus-visible-006.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-006.html
@@ -5,17 +5,17 @@
   <title>CSS Test (Selectors): contenteditable elements always match :focus-visible</title>
   <link rel="author" title="Alice Boxhall" href="aboxhall@chromium.org" />
   <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
   <script src="/resources/testdriver.js"></script>
   <script src="/resources/testdriver-vendor.js"></script>
   <style>
-    @supports not (selector(:focus-visible)) {
+    @supports not selector(:focus-visible) {
       :focus {
         outline: red solid 5px;
         background-color: red;
       }
     }
 
     span[contenteditable] {
         border: 1px solid black;

--- a/testing/web-platform/tests/css/selectors/focus-visible-008.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-008.html
@@ -5,17 +5,17 @@
   <title>CSS Test (Selectors): Keyboard focus enables :focus-visible</title>
   <link rel="author" title="Alice Boxhall" href="aboxhall@chromium.org" />
   <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
   <script src="/resources/testdriver.js"></script>
   <script src="/resources/testdriver-vendor.js"></script>
   <style>
-    @supports not (selector(:focus-visible)) {
+    @supports not selector(:focus-visible) {
       #el:focus {
         outline: red solid 5px;
         background-color: red;
       }
     }
 
     :focus-visible {
       outline: green solid 5px;

--- a/testing/web-platform/tests/css/selectors/focus-visible-009.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-009.html
@@ -3,17 +3,17 @@
 <head>
   <meta charset="utf-8" />
   <title>CSS Test (Selectors): Keyboard focus enables :focus-visible</title>
   <link rel="author" title="Alice Boxhall" href="aboxhall@chromium.org" />
   <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
   <style>
-    @supports not (selector(:focus-visible)) {
+    @supports not selector(:focus-visible) {
       #button:focus {
         outline: red solid 5px;
         background-color: red;
       }
     }
 
     :focus-visible {
       outline: green solid 5px;

--- a/testing/web-platform/tests/css/selectors/focus-visible-010.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-010.html
@@ -3,17 +3,17 @@
 <head>
   <meta charset="utf-8" />
   <title>CSS Test (Selectors): Keyboard focus enables :focus-visible</title>
   <link rel="author" title="Alice Boxhall" href="aboxhall@chromium.org" />
   <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
   <style>
-    @supports not (selector(:focus-visible)) {
+    @supports not selector(:focus-visible) {
       :focus {
         outline: red solid 5px;
         background-color: red;
       }
     }
 
     :focus-visible {
       outline: green solid 5px;

--- a/testing/web-platform/tests/css/selectors/focus-visible-011.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-011.html
@@ -5,17 +5,17 @@
   <title>CSS Test (Selectors): :focus-visible matches even if preventDefault() is called</title>
   <link rel="author" title="Alice Boxhall" href="aboxhall@chromium.org" />
   <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
   <script src="/resources/testdriver.js"></script>
   <script src="/resources/testdriver-vendor.js"></script>
   <style>
-    @supports not (selector(:focus-visible)) {
+    @supports not selector(:focus-visible) {
       #next:focus {
         outline: red solid 5px;
         background-color: red;
       }
     }
 
     button {
       border: 0;

--- a/testing/web-platform/tests/css/selectors/focus-visible-012.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-012.html
@@ -6,17 +6,17 @@
   <link rel="author" title="Alice Boxhall" href="aboxhall@chromium.org" />
   <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
   <script src="/resources/testdriver.js"></script>
   <script src="/resources/testdriver-actions.js"></script>
   <script src="/resources/testdriver-vendor.js"></script>
   <style>
-    @supports not (selector(:focus-visible)) {
+    @supports not selector(:focus-visible) {
       :focus {
         outline: red solid 5px;
         background-color: red;
       }
     }
 
     :focus-visible {
       outline: 0;

--- a/testing/web-platform/tests/css/selectors/focus-visible-013.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-013.html
@@ -3,17 +3,17 @@
 <title>CSS Selectors Test: :focus-visible does not match after mouse focus even if previous focused element was matching :focus-visible</title>
 <link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/resources/testdriver.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
 <style>
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     :focus {
       outline: red solid 5px;
     }
   }
 
   #initial:focus-visible {
     outline: green solid 5px;
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-014.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-014.html
@@ -2,17 +2,17 @@
 <meta charset="utf-8" />
 <title>CSS Selectors Test: :focus-visible matches after script focus move</title>
 <link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
 <meta name="assert" content="This test checks that if the active element matches ':focus-visible' and a script causes focus to move elsewhere, the newly focused element should match ':focus-visible'.">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <style>
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     :focus {
       outline: red solid 5px;
       background-color: red;
     }
   }
 
   :focus-visible {
     background: lime;

--- a/testing/web-platform/tests/css/selectors/focus-visible-015.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-015.html
@@ -4,17 +4,17 @@
 <link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
 <meta name="assert" content="This test checks that if the active element does not match ':focus-visible' and a script causes focus to move elsewhere, the newly focused element should not match ':focus-visible'.">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/resources/testdriver.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
 <style>
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     :focus {
       outline: red solid 5px;
       background-color: red;
     }
   }
 
   :focus-visible {
     background: red;

--- a/testing/web-platform/tests/css/selectors/focus-visible-016.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-016.html
@@ -4,17 +4,17 @@
 <link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
 <link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
 <meta name="assert" content="This test checks that even if the active element does not match ':focus-visible' and a script causes focus to move into a text input, the text input should  match ':focus-visible'.">
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/resources/testdriver.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
 <style>
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     :focus {
       outline: red solid 5px;
       background-color: red;
     }
   }
 
   div:focus-visible {
     background: red;

--- a/testing/web-platform/tests/css/selectors/focus-visible-017.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-017.html
@@ -8,17 +8,17 @@
 <script src="/resources/testharnessreport.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-018.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-018.html
@@ -10,17 +10,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-019.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-019.html
@@ -10,17 +10,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-001.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-001.html
@@ -7,17 +7,17 @@
 <script src="/resources/testharnessreport.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-002.tentative.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-002.tentative.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-003.tentative.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-003.tentative.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-004.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-004.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-005.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-005.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-006.tentative.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-006.tentative.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-007.tentative.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-007.tentative.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-008.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-008.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-009.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-009.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-010.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-010.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-011.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-011.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-012.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-012.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-013.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-013.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-014.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-014.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-015.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-015.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-016.tentative.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-016.tentative.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-017.tentative.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-017.tentative.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-018.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-018.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }

--- a/testing/web-platform/tests/css/selectors/focus-visible-script-focus-019.html
+++ b/testing/web-platform/tests/css/selectors/focus-visible-script-focus-019.html
@@ -9,17 +9,17 @@
 <script src="/resources/testdriver-vendor.js"></script>
 <script src="/css/support/parsing-testcommon.js"></script>
 <style>
   #warning {
     display: none;
     background: red;
   }
 
-  @supports not (selector(:focus-visible)) {
+  @supports not selector(:focus-visible) {
     #instructions {
       display: none;
     }
 
     #warning {
       display: block;
     }
   }