Skip to content

Learn Measure Blog Case studies About

Best Practices audits

Improve code health of your web page following these best practices

Overview

These checks highlight opportunities to improve the overall code health of your web app.

Table of Contents

General best practices
Make your page fast
Make your page secure
Create a good user experience
Avoid deprecated technologies
Diagnostic audits

General best practices

Page lacks the HTML doctype, thus triggering quirks mode
Browser errors were logged to the console
Displays images with incorrect aspect ratio

Make your page fast

Does not use HTTP/2 for all of its resources
Uses document.write()
Use passive listeners to improve scrolling performance

Make your page secure

Does not use HTTPS
Links to cross-origin destinations are unsafe
Includes front-end JavaScript libraries with known security vulnerabilities
Ensure CSP is effective against XSS attacks

Create a good user experience

Requests the geolocation permission on page load
Requests the notification permission on page load
Prevents users from pasting into password fields

Avoid deprecated technologies

Uses Application Cache
Uses deprecated APIs

Diagnostic audits

Detected JavaScript libraries

Contribute

File a bug
View source

Related content

developer.chrome.com
Chrome updates
Web Fundamentals
Case studies
Podcasts
Shows

Connect

Twitter
YouTube

Chrome
Firebase
Google Cloud Platform
All products

Terms & Privacy
Community Guidelines

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies.