How can performance improve conversion?
Learn what impact website performance has on different parts of the ecommerce funnel
How do I know if my site was hacked?
Steps to follow if you think that your site may be hacked.
How the payment ecosystem works
Learn more about who is involved in the Web Payments ecosystem, how they interact with each other, and how you can participate.
Payment Request API overview
Learn how the Payment Request API works at a high level.
How search works
Search engines are the digital version of a librarian. They use a comprehensive index to help find the right information for a query. Understanding the basics of search prepares you to make your content discoverable for users.
How to choose your Baseline target
Learn what Baseline targets are, how to choose one, and how it can help your development experience.
How to distribute Signed HTTP Exchanges (SXG) using nginx
How to get and serve SXG files using nginx, and the challenges of subresource prefetching.
How to file a good browser bug
Telling browser vendors about issues you find in their browser, on a specific device or platform is an integral part of making the web platform better!
How to measure speed?
Real-world performance is highly variable due to differences in users' devices, network connections, and other factors. In this post we explore tools that can help you collect lab or field data to assess page performance.
How to review for accessibility
How to review your site for accessibility issues.
How to set up Signed HTTP Exchanges (SXG) using nginx
How to generate a TLS certificate with SXG extensions, install tools for generating SXG files, and configure nginx to serve SXG files.
How to stay fast?
Brands that optimize speed will often find they regress quickly. In this post we explore how to make sure your fast experience stays fast.
Use HTTPS for local development
web.dev engineering blog #1: How we build the site and use Web Components
In this first post from the web.dev engineering team, learn about how we build the site—including our use of Eleventy and Web Components.
Building Designcember
A peek into the process and tools used to build the holiday-calendar-style experience of Designcember.
How browsers work
Prevent unnecessary network requests with the HTTP Cache
The browser's HTTP Cache is your first line of defense against unnecessary network requests.
Improve security and privacy by updating HTTP Cache
Forgetting or misusing the Cache-Control header might negatively impact the security of your website and your users' privacy. Get recommendations for high-value websites.
Icons and browser colors
Modern browsers make it easy to customize certain components, like icons, the address bar color, and even add things like custom tiles. These simple tweaks can increase engagement and bring users back to your site.
Identify resources loaded from the network
Coming up with the right caching strategies for your web application requires getting a handle on what exactly you're loading. When building a reliable web application, the network can be subject to all kinds of dark forces. You need to understand the network's vulnerabilities if you hope to cope with them in your app.
Identify slow third-party JavaScript
Learn how to use Lighthouse and Chrome DevTools to identify slow third-party resources.
Identify the vulnerability
How to search for vulnerabilities on your site.
It's time to lazy-load offscreen iframes!
This post covers the loading attribute and how to use it to control the loading of iframes.
Use image CDNs to optimize images
Consider using an image CDN to optimize your site's images and reduce its data cost for your users.
Feedback from the summer 2019 image optimization survey
Comments from survey respondents about various image optimization techniques.
Image policies for fast load times and more
Images take up a significant amount of visual space and make up the majority of the downloaded bytes on a website. Use the new feature policies to identify oversized images.
Make your site picture perfect with images.tooling.report
Check out the state of image tooling.
Imperative caching guide
How to communicate window and service worker to perform tasks related to performance, caching and offline.
HTML Imports
Explore product review suggestions with client-side AI
Online stores can see a 270% increase in conversions by displaying product reviews. Support better reviews with client-side AI.
Incorporate performance budgets into your build process
The best way to keep an eye on your performance budget is to automate it. Find out how to choose a tool that best fits your needs and current setup.
Work with IndexedDB
A guide to the basics of IndexedDB.
Best Practices for Persisting Application State with IndexedDB
Learn best practices for syncing application state between IndexedDB and popular state management libraries.
Databinding UI elements with IndexedDB
The inert attribute
The inert property is a global HTML attribute that simplifies how to remove and restore user input events for an element, including focus events and events from assistive technologies.
Interaction to Next Paint (INP)
This post introduces the Interaction to Next Paint (INP) metric and explains how it works, how to measure it, and offers suggestions on how to improve it.
What does it take to be installable?
Progressive Web App installability criteria.
IntersectionObserver's coming into view
IntersectionObservers let you know when an observed element enters or exits the browser's viewport.
Trust is good, observation is best: Intersection Observer v2
Intersection Observer v2 can detect if an element was visible at the time of intersection.
Important Security Terminology
Two of the hurdles developers face when migrating to HTTPS are concepts and terminology. This guide provides a brief overview of both.
Introduction to fetch()
The `fetch()` API is landing in the window object and can replace XHRs.
Is it :modal?
This handy CSS pseudo-selector gives you a way to select elements that are modal.
JavaScript: What is the meaning of this?
Figuring out the value of `this` can be tricky in JavaScript, here's how to do it…
The difference between JavaScript libraries and frameworks
Understand the differences between frameworks and libraries in the context of a client-side JavaScript environment.
Keyboard access fundamentals
Many users rely on the keyboard to navigate applications. Design a keyboard navigation strategy for your application to create a better experience for everyone.
Why lab and field data can be different (and what to do about it)
Learn why tools that monitor Core Web Vitals metrics may report different numbers, and how to interpret those differences.
Labels and text alternatives
For a screen reader to present a spoken UI to the user, meaningful elements must have proper labels or text alternatives.
Lazy loading video
This post explains lazy loading and the options available to you to lazy loading video.
Largest Contentful Paint (LCP)
This post introduces the Largest Contentful Paint (LCP) metric and explains how to measure it
The performance effects of too much lazy loading
Eagerly loading images within the initial viewport—while liberally lazy loading the rest—can improve Web Vitals while loading fewer bytes.
Core Web Vitals | Articles
Life of a payment transaction
Learn how merchants integrate payment apps, how payment transactions work with the Payment Request API, and what's possible in Web Payments.
CSS color-scheme-dependent colors with light-dark()
description: Define colors that react to the used color-scheme with the light-dark() function.
Performance monitoring with Lighthouse CI
Learn how to setup Lighthouse CI and integrate it into developer workflows.
Lighthouse user flows
Try out a new Lighthouse API to measure performance and best practices throughout a user flow.
Prefetch resources to speed up future navigations
Learn about rel=prefetch resource hint and how to use it.
web.dev LIVE wrap-up
A summary of the major news and updates that were announced during our 3-day online community event, and a reminder about upcoming regional events.
Understand LLM sizes
Take a look at a few real-world LLMs and the practical implications of different model sizes.
Techniques to make a web app load fast, even on a feature phone
Feature phones are making a resurgence and are popular, especially in emerging markets where 2G is the norm. Here are our learnings from making PROXX, a mobile Minesweeper clone, load fast on feature phones on 2G.