zumerlab
diff --git a/‎src/utils/css.js‎
Lines changed: 17 additions & 4 deletions b/‎src/utils/css.js‎
Lines changed: 17 additions & 4 deletions
@@ -247,15 +247,25 @@ export function generateCSSClasses(styleMap) {
  * Fixes #371 (pseudos in iframe body not rendering when capturing body only).
  *
  * @param {Element} el
- * @returns {Window}
+ * @returns {Window|null}
  */
 function getWindowForElement(el) {
  try {
  const doc = el?.ownerDocument
- const win = doc?.defaultView
+ if (!doc) return typeof window !== 'undefined' ? window : null
+ let win = doc.defaultView
  if (win && typeof win.getComputedStyle === 'function') return win
+ // In some environments (e.g. srcdoc iframe before fully ready) defaultView can be null.
+ // Find the frame whose document is this document so we use the iframe's window.
+ if (typeof window !== 'undefined' && window.frames) {
+ for (let i = 0; i < window.frames.length; i++) {
+ try {
+ if (window.frames[i]?.document === doc) return window.frames[i]
+ } catch { /* cross-origin */ }
+ }
+ }
  } catch { /* cross-origin etc */ }
- return typeof window !== 'undefined' ? window : (el?.ownerDocument?.defaultView || null)
+ return typeof window !== 'undefined' ? window : null
 }
 
 /**
@@ -311,7 +321,10 @@ export function getStyle(el, pseudo = null) {
 
  if (!st && typeof window !== 'undefined' && typeof window.getComputedStyle === 'function') {
  try {
- st = window.getComputedStyle(el, pseudo)
+ // Only use global window when the element belongs to the same document (e.g. avoid iframe cross-document call).
+ if (el.ownerDocument === document) {
+ st = window.getComputedStyle(el, pseudo)
+ }
  } catch {
  // ignore; handled below
  }