fc9501a637
When a PDF is "marked" we now generate a separate DOM that represents the structure tree from the PDF. This DOM is inserted into the <canvas> element and allows screen readers to walk the tree and have more information about headings, images, links, etc. To link the structure tree DOM (which is empty) to the text layer aria-owns is used. This required modifying the text layer creation so that marked items are now tracked.
70 lines
2.3 KiB
JavaScript
70 lines
2.3 KiB
JavaScript
/* Copyright 2021 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const { closePages, loadAndWait } = require("./test_utils.js");
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describe("accessibility", () => {
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describe("structure tree", () => {
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let pages;
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beforeAll(async () => {
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pages = await loadAndWait("structure_simple.pdf", ".structTree");
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});
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afterAll(async () => {
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await closePages(pages);
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});
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it("must build structure that maps to text layer", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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await page.waitForSelector(".structTree");
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// Check the headings match up.
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const head1 = await page.$eval(
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".structTree [role='heading'][aria-level='1'] span",
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el =>
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document.getElementById(el.getAttribute("aria-owns")).textContent
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);
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expect(head1).withContext(`In ${browserName}`).toEqual("Heading 1");
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const head2 = await page.$eval(
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".structTree [role='heading'][aria-level='2'] span",
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el =>
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document.getElementById(el.getAttribute("aria-owns")).textContent
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);
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expect(head2).withContext(`In ${browserName}`).toEqual("Heading 2");
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// Check the order of the content.
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const texts = await page.$$eval(".structTree [aria-owns]", nodes =>
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nodes.map(
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el =>
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document.getElementById(el.getAttribute("aria-owns"))
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.textContent
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)
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);
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expect(texts)
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.withContext(`In ${browserName}`)
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.toEqual([
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"Heading 1",
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"This paragraph 1.",
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"Heading 2",
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"This paragraph 2.",
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]);
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})
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);
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});
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});
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});
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