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Using proper styling to improve accessibility
Using ARIA labels to create accessible element descriptions
The importance of the default DOM order
Hiding content from assistive technology
Introduction to ARIA and non-native HTML semantics
Overview of screen focus in accessibility
Introduction to semantics and assistive technology
The role of semantics in page navigation
Using the alt attribute to provide text alternatives for images
Introduction to the Accessibility Tree
Modifying the DOM order with tabindex
Improving accessibility for web pages
Learn how to set up CSS & JS preprocessors to help you code more efficiently.
Set up persistent authoring in Chrome DevTools so you can both see your changes immediately and save those changes to disk.
Learn how to record heap snapshots with the Chrome DevTools heap profiler and find memory leaks.
RAIL is a user-centric performance model. Every web app has these four distinct aspects to its life cycle, and performance fits into them in different ways: Response, Animation, Idle, Load.
This section describes common terms used in memory analysis, and is applicable to a variety of memory profiling tools for different languages.
The DOM tree view in the Chrome DevTools Elements panel displays the DOM structure of the current web page. Live-edit the content and structure of your page through DOM updates.
Inspect and edit the HTML and CSS of your pages.
Out of the box, every desktop browser comes with a set of developer tools, you can extend and add to these with extensions or plugins for your browser.
It’s easy to overlook the network conditions your users will face on mobile. Use DevTools to emulate different network conditions. Fix any load time issues and your users will thank you.
Compare similar data objects using the table() method.
Console logging is a powerful way to inspect what your page or application does. Let's start with console.log() and explore other advanced usage.
Explore the state of any item on your page from the DevTools console.
Take advantage of the Console API to measure execution times and count statement executions.
The Chrome DevTools Command Line API offers various ways to observe and inspect event listeners
Measure the network performance of your web application using the Chrome DevTools Network panel.
Touch screens, GPS chips, and accelerometers can be difficult to test since most desktops don't have them. The Chrome DevTools sensor emulators reduce the overhead of testing by emulating common mobile device sensors.
Host a site on a development machine web server, and then access the content from an Android device.
Users expect pages to be interactive and smooth. Each stage in the pixel pipeline represents an opportunity to introduce jank. Learn about tools and strategies to identify and fix common problems that slow down runtime performance.
Follow along with this interactive guide to learn how to use DevTools to diagnose forced synchronous layouts.
Use the Styles pane in Chrome DevTools to inspect and modify the CSS styles associated to an element.
Your job doesn't end with ensuring your site runs great across Chrome and Android. Even though Device Mode can simulate a range of other devices like iPhones, we encourage you to check out other browsers solutions for emulation.
Use the allocation profiler tool to find objects that aren't being properly garbage collected, and continue to retain memory.
Keep your client-side code readable and debuggable even after you've combined, minified or compiled it.
Debug WebViews in your native Android apps using Chrome Developer Tools.
Identify expensive functions using the Chrome DevTools CPU Profiler.
The timeline events mode displays all events triggered while making a recording. Use the timeline event reference to learn more about each timeline event type.
Set up shortcuts for the command line tasks you use over and over again. If you find yourself typing the same thing in your command line repeatedly, this will alleviate that.
Build your multi-device site from the ground up. Learn how to speed up development and create a fast loading site with a set of build process tools.
Your code editor is your main development tool; you use it to write and save lines of code. Write better code faster by learning your editor's shortcuts and installing key plugins.