context-helper.js - mozsearch

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// Usage: in the top-level Window, include:

//

// <script src="resources/context-helper.js"></script>

// <script>

//   window.scriptToRun = '...';

// </script>

// <iframe id="entry" src="entry/entry.html"></iframe>

//

// Then `scriptToRun` is evaluated, with:

// - The entry Realm is that of entry/entry.html

// - The incumbent Realm is that of incumbent/empty.html

// - The relevant Realm of `relevantWindow`, `relevantWindow.location` etc. is

//   that of relevant/empty.html

window.scriptToRun = '';

const entryUrl = new URL('entry/entry.html', location).href;

const incumbentUrl = new URL('incumbent/empty.html', location).href;

const relevantUrl = new URL('relevant/empty.html', location).href;

function go() {

    const entry = document.querySelector('#entry');

    const incumbent = entry.contentDocument.querySelector('#incumbent');

    const incumbentScript = incumbent.contentDocument.createElement('script');

    incumbentScript.textContent = `

    function go() {

      const relevantWindow =

          parent.document.querySelector('#relevant').contentWindow;

      ${window.scriptToRun}

`;

    incumbent.contentDocument.head.appendChild(incumbentScript);

    incumbent.contentWindow.go();