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Achraf (abz)
9d378b0e7b
Previously, `validateTarget` only checked if the target element or its host (if it was a ShadowRoot) was directly contained in the document body. This failed in cases where the target element was nested inside a shadow DOM, which itself was attached to the document. This commit introduces a new helper `isAttachedToDocument` that traverses through parent nodes and shadow roots to ensure that the target is ultimately attached to the given document. Additionally, it now throws a clear error if `document.defaultView` is missing, indicating that the target document is detached or invalid. This ensures proper validation of mount targets, including complex scenarios with shadow roots and iframes.