Function sanitizeElement

packages/editor/src/utils/paste-sanitizer.ts:97–120

(el: HTMLElement)

}

function sanitizeElement(el: HTMLElement): void {
  const tagName = el.tagName.toLowerCase();

  const allowedForTag = PRESERVED_ATTRIBUTES[tagName] || [];
  const allowedGlobal = PRESERVED_ATTRIBUTES['*'] || [];
  const allowed = new Set([...allowedForTag, ...allowedGlobal]);

  const attributesToRemove: string[] = [];

  for (const attr of Array.from(el.attributes)) {
    if (attr.name.startsWith('data-')) {
      attributesToRemove.push(attr.name);
      continue;
    }

    if (!allowed.has(attr.name)) {
      attributesToRemove.push(attr.name);
    }
  }

  for (const attr of attributesToRemove) {
    el.removeAttribute(attr);
  }
}