fix(migrate): text-from-element window

Author: std-microblock

migrate/text-from-element.ts

@@ -24,15 +24,15 @@ function isBlockElement(node: Node): boolean {
         return true;
     }
 
-    const style = window.getComputedStyle(element);
+    const style = element.ownerDocument.defaultView!.getComputedStyle(element);
     return style.display === 'block' ||
         style.display === 'flex' ||
         style.display === 'grid' ||
         style.display.startsWith('table');
 }
 
 function isElementVisible(element: HTMLElement): boolean {
-    const style = window.getComputedStyle(element);
+    const style = element.ownerDocument.defaultView!.getComputedStyle(element);
     return style.display !== 'none' &&
         style.visibility !== 'hidden' &&
         style.opacity !== '0';