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The Acid3 Test VS CodePen

Compare The Acid3 Test VS CodePen and see what are their differences

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The Acid3 Test logo The Acid3 Test

The Acid3 Test is an online test page developed by the Web Standards Project to help everyone check how compliant a specific browser is with different web standards like JavaScript and Document Object Model.

CodePen logo CodePen

A front end web development playground.
  • The Acid3 Test Landing page
    Landing page //
    2023-09-05
  • CodePen Landing page
    Landing page //
    2018-09-30

The Acid3 Test features and specs

No features have been listed yet.

CodePen features and specs

  • Real-time Collaboration
    Developers can collaborate with others in real-time, making it easy to work on projects with teammates or seek help from the community.
  • Immediate Visual Feedback
    CodePen allows you to see the results of your code as you write it, which is highly beneficial for learning and debugging.
  • Integrated Development Environment (IDE)
    CodePen provides a comfortable and feature-rich online IDE environment with syntax highlighting, autocomplete, and more.
  • Community-Driven
    Users can share their work with the CodePen community, receive feedback, and explore a wide range of projects created by others.
  • Extensive Resources
    CodePen offers a wealth of examples and templates for various web development tasks, making it a useful resource for learning and inspiration.
  • Cross-Device Accessibility
    Being an online platform, CodePen can be accessed from any device with an internet connection, making it convenient for developers on the move.

Possible disadvantages of CodePen

  • Limited Offline Functionality
    Since CodePen is primarily an online tool, it requires an internet connection for most of its features to work, limiting its usefulness in offline environments.
  • Performance Constraints
    Complex or resource-intensive projects may not perform as well on CodePen as they would in a full-fledged local development environment.
  • Subscription Costs
    While many features are free, advanced functionalities and additional storage options require a paid subscription, which may not be ideal for all users.
  • Limited Backend Capabilities
    CodePen is primarily designed for front-end development, so it offers limited support for backend technologies, making it less suitable for full-stack or server-side development.
  • Dependency Management
    Managing dependencies and libraries can be cumbersome compared to local development environments which have better tools for this purpose, like npm.
  • Security Concerns
    Sharing projects with the public can expose your code and assets to unauthorized use, posing potential intellectual property and security risks.

The Acid3 Test videos

The Acid3 Test - Motorola Milestone

CodePen videos

What Is Codepen?

More videos:

  • Review - Learn to use CodePen from a co-founder of CodePen
  • Review - Using CodePen For Inspiration & Learning

Category Popularity

0-100% (relative to The Acid3 Test and CodePen)
Website Testing
100 100%
0% 0
Text Editors
0 0%
100% 100
Browser Testing
100 100%
0% 0
Programming
0 0%
100% 100

User comments

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Reviews

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The Acid3 Test Reviews

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CodePen Reviews

Best Forums for Developers to Join in 2025
Codepen is a social network for developers to show off their work, ask and answer questions, and exchange ideas. It's like a Reddit for coding and design, with a large community of talented web developers.
Source: www.notchup.com
Top 10 Developer Communities You Should Explore
Codepen is a social development environment that allows developers to showcase their work and experiment with HTML, CSS, and JavaScript in a collaborative space. Codepen’s focus on visual and interactive development makes it an excellent community for front-end developers and designers.
Source: www.qodo.ai
8 Best Replit Alternatives & Competitors in 2022 (Free & Paid) - Software Discover
Codepen is a social development environment for front-end designers and developers. Build and deploy a website, show off your work, build test cases to learn.
Best Online Code Editors For Web Developers
Probably the most popular online code editor. CodePen is fast, easy to use, and allows a web developer to write and share HTML/CSS/JS code online.
Source: techarge.in
Top 25 websites for coding challenge and competition [Updated for 2021]
CodePen is a cool online IDE that allows you to write code in your browser and see the result just as you build it. CodePen challenges is a place for leveling up your skills by building things. Each week, new challenges appear for you to tackle, and the best “Pens” get picked.

Social recommendations and mentions

Based on our record, CodePen seems to be a lot more popular than The Acid3 Test. While we know about 503 links to CodePen, we've tracked only 6 mentions of The Acid3 Test. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

The Acid3 Test mentions (6)

  • Welcome to Ladybird, a independent web browser
    There’s websites decided to pointing out which standards various browsers do & don’t support. https://caniuse.com/ (And older not as relevant one is http://acid3.acidtests.org/ ). - Source: Hacker News / 11 months ago
  • Shadow: New browser engine made almost in JavaScript
    Https://shadow.goose.icu/?http://acid3.acidtests.org/. - Source: Hacker News / over 1 year ago
  • Should there be a standard prompt for showcasing models?
    During the browser wars, web developers created “Acid Tests” to see how well a browser supported various style sheet and markup conventions. When the acid tests became popular, there were accusations that browser engineers were manipulating their rendering engines to pass those tests. For instance, some cascading style sheet attribute would pass the test, but fail to work as expected under normal use on a web page. Source: about 2 years ago
  • Everyone should use Firefox
    I am sure that both firefox and chromium-based browsers will pass most of something like ACID3 test. But at this stage standards have nothing to do with reality. Standards define perhaps 10% of the code you are writing and interpretation of the rest 90% of the code is up to the browsers. Source: almost 3 years ago
  • SerenityOS Browser now passes the Acid3 test
    The old version (http://acid3.acidtests.org/) will reach 97/100 on modern compliant browsers. There is a newer version (https://wpt.live/acid/acid3/test.html) which incorporates the changes made to the specs in the meantime, so modern browsers will reach 100/100 on this one again. The test was carried out against this version, as you can see in the address bar in the screenshot. - Source: Hacker News / about 3 years ago
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CodePen mentions (503)

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What are some alternatives?

When comparing The Acid3 Test and CodePen, you can also consider the following products

HTML5test - HTML5test is a platform that assigns you a score based on how well your browser follows the requirements of the HTML5 standard.

JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.

Can I use - Compatibility tables for support of HTML5, CSS3, SVG and more in desktop and mobile browsers.

CodeSandbox - Online playground for React

IETester - ietester is an application that allows to test on multiple ie versions at the same time in the same application

GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.