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  <!-- jQuery -->
  <script src=""></script>

  <!-- 全画面広告 -->
  <div class="screen-ad">
    <a href="" target="_blank" rel="noopener noreferrer"></a>
  <!-- ここまで -->
<!-- 以下装飾 -->
  一度クリックするまでは画面全体がリンクになっており、その間はサイト内で他のアクションが取れない。<br>もちろん、広告を踏むまでこの<a href="">Googleへのリンク</a>もクリックできない</p>


                /*** 全画面広告 ***/
  position: fixed; /*画面に固定*/
  top: 0;
  left: 0;
  width: 100vw; /*画面幅*/
  height: 100vh; /*画面の高さ*/
  z-index: 999;

/*** リンクを親要素いっぱいに広げる ***/
.screen-ad a{
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;

/*** クリック後 ***/
  display: none; /*削除*/

/*** サンプル用装飾 ***/
  padding: 1rem;


                <!-- クリック後は.clickedクラスを付与 -->
$('.screen-ad').on('click', function() {