/**
 * Copyright 2019 Google Inc. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ const iframe = document . querySelector ( 'iframe' ) as HTMLIFrameElement ; const { width , height } = iframe . getBoundingClientRect ( ) ; function resizeIframe ( ) { const xScale = document . documentElement . offsetWidth / width ; const yScale = document . documentElement . offsetHeight / height ; const scale = Math . min ( xScale , yScale ) ; iframe . style . transform = `translate(-50%, -50%) scale(${ scale })` ; } window . onresize = resizeIframe ; resizeIframe ( ) ; window . onkeydown = ( event ) => { if ( event . key === 'f' ) { document . documentElement . requestFullscreen ( ) ; } } ;