<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <title>reveal.js - Test Iframe Backgrounds</title> <link rel="stylesheet" href="../dist/reveal.css"> <link rel="stylesheet" href="../node_modules/qunit/qunit/qunit.css"> <script src="../node_modules/qunit/qunit/qunit.js"></script> </head> <body style="overflow: auto;"> <div id="qunit"></div> <div id="qunit-fixture"></div> <div class="reveal" style="display: none;"> <div class="slides"> <section data-background-iframe="https://revealjs.com">1</section> <section data-background-iframe="https://revealjs.com">2</section> <section data-background-iframe="https://revealjs.com" data-preload>3</section> <section data-background-iframe="https://revealjs.com">4</section> <section data-background-iframe="https://revealjs.com">5</section> <section data-background-iframe="https://revealjs.com">6</section> </div> </div> <script src="../dist/reveal.js"></script> <script> Reveal.initialize({ viewDistance: 3 }).then( () => { function getIframe( index ) { return document.querySelectorAll( '.slide-background' )[index].querySelector( 'iframe' ); } QUnit.module( 'Iframe' ); QUnit.test( 'Using default settings', function( assert ) { Reveal.slide(0); assert.strictEqual( getIframe(1).hasAttribute( 'src' ), false, 'not preloaded when within viewDistance' ); Reveal.slide(1); assert.strictEqual( getIframe(1).hasAttribute( 'src' ), true, 'loaded when slide becomes visible' ); Reveal.slide(0); assert.strictEqual( getIframe(1).hasAttribute( 'src' ), false, 'unloaded when slide becomes invisible' ); }); QUnit.test( 'Using data-preload', function( assert ) { Reveal.slide(1); assert.strictEqual( getIframe(2).hasAttribute( 'src' ), true, 'preloaded within viewDistance' ); assert.strictEqual( getIframe(1).hasAttribute( 'src' ), true, 'loaded when slide becomes visible' ); Reveal.slide(0); assert.strictEqual( getIframe(3).hasAttribute( 'src' ), false, 'unloads outside of viewDistance' ); }); QUnit.test( 'Using preloadIframes: true', function( assert ) { Reveal.configure({ preloadIframes: true }); Reveal.slide(1); assert.strictEqual( getIframe(0).hasAttribute( 'src' ), true, 'preloaded within viewDistance' ); assert.strictEqual( getIframe(1).hasAttribute( 'src' ), true, 'preloaded within viewDistance' ); assert.strictEqual( getIframe(2).hasAttribute( 'src' ), true, 'preloaded within viewDistance' ); }); QUnit.test( 'Using preloadIframes: false', function( assert ) { Reveal.configure({ preloadIframes: false }); Reveal.slide(0); assert.strictEqual( getIframe(1).hasAttribute( 'src' ), false, 'not preloaded within viewDistance' ); assert.strictEqual( getIframe(2).hasAttribute( 'src' ), false, 'not preloaded within viewDistance' ); Reveal.slide(1); assert.strictEqual( getIframe(1).hasAttribute( 'src' ), true, 'loaded when slide becomes visible' ); }); } ); </script> </body> </html>