From 9191fc8953c036a855b45df6b14a4b1662ff2c93 Mon Sep 17 00:00:00 2001
From: Stanislav A <s.atroschenko@adguard.com>
Date: Wed, 18 Jan 2023 17:09:27 +0300
Subject: [PATCH] gaurd CSSStyleSheet constructor

---
 src/scriptlets/inject-css-in-shadow-dom.js | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/src/scriptlets/inject-css-in-shadow-dom.js b/src/scriptlets/inject-css-in-shadow-dom.js
index b927f2f26..c9f8ca81b 100644
--- a/src/scriptlets/inject-css-in-shadow-dom.js
+++ b/src/scriptlets/inject-css-in-shadow-dom.js
@@ -46,20 +46,19 @@ export function injectCssInShadowDom(source, cssRule, hostSelector = '') {
     }
 
     const callback = (shadowRoot) => {
-        const stylesheet = new CSSStyleSheet();
         try {
-            stylesheet.insertRule(cssRule);
-        } catch {
-            logMessage(source, `Failed to parse the rule: ${cssRule}`);
-            return;
-        }
-
-        // attach stylesheet to shadow root so the whole subtree would be affected
-        if (shadowRoot.adoptedStyleSheets) {
-            // adoptedStyleSheets is not yet supported by Safari
+            // adoptedStyleSheets and CSSStyleSheet constructor are not yet supported by Safari
             // https://developer.mozilla.org/en-US/docs/Web/API/Document/adoptedStyleSheets
+            // https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleSheet/CSSStyleSheet
+            const stylesheet = new CSSStyleSheet();
+            try {
+                stylesheet.insertRule(cssRule);
+            } catch {
+                logMessage(source, `Failed to parse the rule: ${cssRule}`);
+                return;
+            }
             shadowRoot.adoptedStyleSheets = [...shadowRoot.adoptedStyleSheets, stylesheet];
-        } else {
+        } catch {
             const styleTag = document.createElement('style');
             styleTag.innerText = cssRule;
             shadowRoot.appendChild(styleTag);