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/** | ||
* Checks if a given target is an HTMLElement. | ||
* | ||
* This function is necessary because `instanceof HTMLElement` can fail | ||
* in environments with multiple execution contexts (e.g., popout windows), | ||
* where `HTMLElement` comes from different global objects. | ||
* Instead, we use feature detection by checking for key properties | ||
* common to all HTML elements (nodeType and tagName). | ||
* | ||
* @param target - The target to check. | ||
* @returns True if the target is an HTMLElement, false otherwise. | ||
*/ | ||
export function isHTMLElement (target: any): target is HTMLElement { | ||
return target && | ||
typeof target === 'object' && | ||
target.nodeType === 1 && // nodeType 1 means it's an element | ||
typeof target.tagName === 'string'; // tagName exists on HTML elements | ||
} |