Method installElement_

src/service/extensions-impl.js:366–380

* Installs the specified element implementation in the ampdoc. * @param {!./ampdoc-impl.AmpDoc} ampdoc * @param {string} name * @param {typeof ../base-element.BaseElement} implementationClass * @param {?string|undefined} css * @private

(ampdoc, name, implementationClass, css)

   * @private
   */
  installElement_(ampdoc, name, implementationClass, css) {
    if (css) {
      installStylesForDoc(
        ampdoc,
        css,
        () => {
          this.registerElementInWindow_(ampdoc.win, name, implementationClass);
        },
        /* isRuntimeCss */ false,
        name
      );
    } else {
      this.registerElementInWindow_(ampdoc.win, name, implementationClass);
    }
  }

  /**
   * @param {!Window} win