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Koa11y VS W3C Markup Validation Service

Compare Koa11y VS W3C Markup Validation Service and see what are their differences

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Koa11y logo Koa11y

Automatically detect accessibility (a11y) issues on webpages

W3C Markup Validation Service logo W3C Markup Validation Service

Validates HTML markup of web pages, one at a time.
  • Koa11y Landing page
    Landing page //
    2019-04-29
  • W3C Markup Validation Service Landing page
    Landing page //
    2019-08-30

Koa11y videos

+ Add

Koa11y: Find Accessibility Issues on your Site

W3C Markup Validation Service videos

+ Add

A Walkthrough the W3C Markup Validation Service

Category Popularity

0-100% (relative to Koa11y and W3C Markup Validation Service)

Koa11y

W3C Markup Validation Service

Developer Tools
100 100%
Developer Tools
0% 0
SEO
32 32%
SEO
68% 68
SEO Tools
0 0%
SEO Tools
100% 100
User Experience
100 100%
User Experience
0% 0

User comments

Share your experience with using Koa11y and W3C Markup Validation Service. For example, how are they different and which one is better?
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Social recommendations and mentions

Based on our record, W3C Markup Validation Service seems to be more popular. It has been mentiond 95 times since March 2021. 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.

Koa11y mentions (0)

We have not tracked any mentions of Koa11y yet. Tracking of Koa11y recommendations started around Mar 2021.

W3C Markup Validation Service mentions (95)

  • What is cross-browser compatibility, and why should you care?
    Validate Your Code Include tools like W3C code validation service and CSS validator to ensure your code meets web standards. - Source: dev.to / 25 days ago
  • What You Need to Know About Domain and Hosting
    ===> Click here to run your code through the HTML validator. - Source: dev.to / 4 months ago
  • Is my code good ?I'm a beginner
    Try looking at tools like https://validator.w3.org/. Source: 5 months ago
  • Searching for the *old* W3C XHTML/CSS validator or something of equivalent functionality
    I'm looking for either that specific validator (older version of https://validator.w3.org/) or an equivalent that can validate pre-HTML5 (DTD-based) files in a similar fashion. I would appreciate any pointers in the right direction. Thanks in advance. Source: 10 months ago
  • Is there an addon that will allow me to see CSS errors in the HTML and CSS?
    Not an addon, but maybe it helps Https://validator.w3.org/. Source: 11 months ago
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What are some alternatives?

When comparing Koa11y and W3C Markup Validation Service, you can also consider the following products

Nibbler - Free tool for testing how good your website is, and what you can do to improve it. Check accessibility, SEO, social media, compliance and more.

HTML Validator - HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla.

tota11y - An accessibility visualization toolkit from Khan Academy

Total Validator - Total Validator can check your website to help ensure that it is accessible, uses valid HTML and CSS, has no broken links, and is free from spelling mistakes.

Page Speaker - Modern web accessibility tools for agencies & webmasters

PageSpeed Insights - PageSpeed is addon for ...

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