Method updateTag

packages/platform-browser/src/browser/meta.ts:134–142

* Modifies an existing ` ` tag element in the current HTML document. * @param tag The tag description with which to replace the existing tag content. * @param selector A tag attribute and value to match against, to identify * an existing tag. A string in the format `"tag_attribute=`val

(tag: MetaDefinition, selector?: string)

   * @return The modified element.
   */
  updateTag(tag: MetaDefinition, selector?: string): HTMLMetaElement | null {
    if (!tag) return null;
    selector = selector || this._parseSelector(tag);
    const meta: HTMLMetaElement = this.getTag(selector)!;
    if (meta) {
      return this._setMetaElementAttributes(tag, meta);
    }
    return this._getOrCreateElement(tag, true);
  }

  /**
   * Removes an existing `<meta>` tag element from the current HTML document.