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ta11y Logo

@ta11y/core

Core library for running web accessibility audits with ta11y.

NPM Build Status JavaScript Style Guide

Install

npm install --save @ta11y/core

Usage

The easiest way to use this package is to use the CLI.

const { Ta11y } = require('@ta11y/core')

const ta11y = new Ta11y()

ta11y.audit('https://en.wikipedia.org')
  .then((results) => {
    console.log(JSON.stringify(results, null, 2))
  })

Alternatively, you can tell ta11y to crawl additional pages starting from the root page.

ta11y.audit('https://en.wikipedia.org', {
  crawl: true,
  maxDepth: 1,
  maxVisit: 64
})

If you want to crawl non-public pages, pass an instance of Puppeteer. This is useful for testing in development or behind corporate firewalls.

const puppeteer = require('puppeteer')

const browser = await puppeteer.launch()

ta11y.audit('http://localhost:3000', {
  browser,
  crawl: true,
  maxDepth: 0
})

You can also pass HTML directly to audit (whole pages or fragments).

ta11y.audit('<!doctype><html><body><h1>I ❤ accessibility</h1></body></html>')

API Key

The free tier is subject to rate limits as well as a 60 second timeout, so if you're crawling a larger site, you're better off running content extraction locally.

If you're processing a non-publicly accessible website (like localhost), then you must perform content extraction locally.

You can bypass rate limiting by signing up for an API key and passing it either via the apiKey option of the Ta11y constructor or via the TA11Y_API_KEY environment variable.

const ta11y = new Ta11y({
  apiKey: '<your-api-key>'
})

Visit ta11y once you're ready to sign up for an API key.

API

Ta11y

Class to run web accessibility audits via the ta11y API.

Type: function (opts)

  • opts object? Config options.
    • opts.apiKey string? Optional ta11y API key which disables rate limits.
    • opts.apiBaseUrl string Optional custom Ta11y deployment which is useful for on-premise scenarios. (optional, default 'https://ssfy.sh/dev/ta11y')

audit

Runs an accessibility audit against the given URL or raw HTML, optionally crawling the site to discover additional pages and auditing those too.

To audit local or private websites, pass an instance of Puppeteer as opts.browser.

The default behavior is to perform content extraction locally and auditing remotely. This works best for auditing publicly accessible websites.

Type: function (urlOrHtml, opts): Promise

  • urlOrHtml string URL or raw HTML to process.
  • opts object Config options.
    • opts.suites Array<string>? Optional array of audit suites to run. Possible values:- section508
      • wcag2a
      • wcag2aa
      • wcag2aaa
      • best-practice
      • htmlDefaults to running all audit suites.
    • opts.browser object? Optional Puppeteer browser instance to use for auditing websites that aren't publicly reachable.
    • opts.crawl boolean Whether or not to crawl additional pages. (optional, default false)
    • opts.maxDepth number Maximum crawl depth while crawling. (optional, default 16)
    • opts.maxVisit number? Maximum number of pages to visit while crawling.
    • opts.sameOrigin boolean Whether or not to only consider crawling links with the same origin as the root URL. (optional, default true)
    • opts.blacklist Array<string>? Optional blacklist of URL glob patterns to ignore.
    • opts.whitelist Array<string>? Optional whitelist of URL glob patterns to only include.
    • opts.gotoOptions object? Customize the Page.goto navigation options.
    • opts.viewport object? Set the browser window's viewport dimensions and/or resolution.
    • opts.userAgent string? Set the browser's user-agent.
    • opts.emulateDevice string? Emulate a specific device type.- Use the name property from one of the built-in devices.
      • Overrides viewport and userAgent.
    • opts.onNewPage function? Optional async function called every time a new page is initialized before proceeding with extraction.
    • opts.file string? Write results to a file (output format determined by file type). See the docs for more info on supported file formats (xls, xlsx, csv, json, html, txt, etc.)

extract

Extracts the content from a given URL or raw HTML, optionally crawling the site to discover additional pages and auditing those too.

To audit local or private websites, pass an instance of Puppeteer as opts.browser.

Type: function (urlOrHtml, opts): Promise

  • urlOrHtml string URL or raw HTML to process.
  • opts object Config options.
    • opts.browser object? Optional Puppeteer browser instance to use for auditing websites that aren't publicly reachable.
    • opts.crawl boolean Whether or not to crawl additional pages. (optional, default false)
    • opts.maxDepth number Maximum crawl depth while crawling. (optional, default 16)
    • opts.maxVisit number? Maximum number of pages to visit while crawling.
    • opts.sameOrigin boolean Whether or not to only consider crawling links with the same origin as the root URL. (optional, default true)
    • opts.blacklist Array<string>? Optional blacklist of URL glob patterns to ignore.
    • opts.whitelist Array<string>? Optional whitelist of URL glob patterns to only include.
    • opts.gotoOptions object? Customize the Page.goto navigation options.
    • opts.viewport object? Set the browser window's viewport dimensions and/or resolution.
    • opts.userAgent string? Set the browser's user-agent.
    • opts.emulateDevice string? Emulate a specific device type.- Use the name property from one of the built-in devices.
      • Overrides viewport and userAgent.
    • opts.onNewPage function? Optional async function called every time a new page is initialized before proceeding with extraction.
    • opts.file string? Write results to a file (output format determined by file type). See the docs for more info on supported file formats (xls, xlsx, csv, json, html, txt, etc.)

auditExtractResults

Runs an accessibility audit against previously collected extraction results from @ta11y/extract.

Type: function (extractResults, opts): Promise

  • extractResults object Extraction results conforming to the output format from @ta11y/extract.
  • opts object Config options. (optional, default {})
    • opts.suites Array<string>? Optional array of audit suites to run. Possible values:- section508
      • wcag2a
      • wcag2aa
      • wcag2aaa
      • best-practice
      • htmlDefaults to running all audits suites.
    • opts.file string? Write results to a file (output format determined by file type). See the docs for more info on supported file formats (xls, xlsx, csv, json, html, txt, etc.)

License

MIT © Saasify