Function srcsetFromElement

src/core/dom/srcset.js:24–39

(element)

 * @return {Srcset<SrcsetSourceDef>}
 */
export function srcsetFromElement(element) {
  const srcsetAttr = element.getAttribute('srcset');
  if (srcsetAttr) {
    return parseSrcset(srcsetAttr);
  }
  // We can't push `src` via `parseSrcset` because URLs in `src` are not always
  // RFC compliant and can't be easily parsed as an `srcset`. For instance,
  // they sometimes contain space characters.
  const srcAttr = element.getAttribute('src');
  userAssert(
    srcAttr,
    'Either non-empty "srcset" or "src" attribute must be specified: %s',
    element
  );
  return srcsetFromSrc(srcAttr);
}

/**
 * Creates a Srcset from a `src` attribute value.