1 files changed, 20 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/document-metadata/interactions-of-styling-and-scripting/support/utils.js b/testing/web-platform/tests/html/semantics/document-metadata/interactions-of-styling-and-scripting/support/utils.js
new file mode 100644
index 0000000000..02d3a095cd
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/document-metadata/interactions-of-styling-and-scripting/support/utils.js
@@ -0,0 +1,20 @@
+function styleExistsInSheet(styleText, sheet) {
+  for (let rule of sheet.cssRules) {
+    if (styleText == rule.cssText)
+      return true;
+    if (rule instanceof CSSImportRule) {
+      if (rule.styleSheet && styleExistsInSheet(styleText, rule.styleSheet))
+        return true;
+    }
+  }
+  return false;
+}
+
+function styleExists(styleText) {
+  for (let sheet of document.styleSheets) {
+    if (styleExistsInSheet(styleText, sheet))
+      return true;
+  }
+  return false;
+}
+