browser_resources_stylesheets_nested_iframes.js

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/* Any copyright is dedicated to the Public Domain.

   http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

// Test that stylesheets are retrieved even if an iframe does not have a content document.

const TEST_URI = URL_ROOT_SSL + "stylesheets-nested-iframes.html";

add_task(async function () {

  const tab = await addTab(TEST_URI);

  const { client, resourceCommand, targetCommand } = await initResourceCommand(

tab

);

  info("Check whether ResourceCommand gets existing stylesheet");

  const availableResources = [];

  await resourceCommand.watchResources([resourceCommand.TYPES.STYLESHEET], {

    onAvailable: resources => availableResources.push(...resources),

});

  // Bug 285395 limits the number of nested iframes to 10, and we have one stylesheet per document.

  await waitFor(() => availableResources.length >= 10);

is(

    availableResources.length,

10,

    "Got the expected number of stylesheets, even with documentless iframes"

);

  targetCommand.destroy();

  await client.close();

});