What is W3C?

How can you be sure that your website speaks the language of search engines? Let us say it right: by checking the language it “really” speaks: HTML, XHTML, and CSS files!

W3C Validation allows you to check the HTML language of your site and make sure it refers to the correct corresponding commands in web standards. In other words, the more that HTML and similar files used by your website comply with web standards, the faster website pages are loaded. W3C increases the power of each website existing in the digital world to adapt to its own ecosystem.

Definition of W3C

It is also necessary to go into the technical part of the job. WC3 Validation stands for Wide Web Consortium. In its simplest definition, this consortium allows users to check their websites for HTML, XHTML, and CSS documents:

  • Are the documents on the websites easily read by major browsers?
  • Do the actions requested in the documents and the actions perceived by the browsers on the internet match each other?
  • Are there any obstacles for browsers to render and index documents?

It is quite challenging to find answers to these questions manually, and even you found some, it is almost impossible to find all of them. Screpy provides the best possible for you with its WC3 Validation service!

You care that your website is user-oriented, SEO-strong, high-performance, and modern in design, right? 


So listen to us: Let us say that all these factors we have mentioned are closely related to technical website optimization. The key to optimizing your website code source to give you the best results is to see the problems. Seeing the problems is easy with Screpy W3C Validator. 

Why Does W3C Validation Matters?

You like Google right? Hey, Google might love you too! But first, you have to meet certain formats and standards. A search engine that aims to appeal to billions of people in the international arena loves a standard language that it can easily understand and scan. This means that as long as you give this language to Google, you will optimize your website technically.

Let’s examine what the W3C Validation service can add to your website’s digital life experience.

Do You Want To Rank In Search Engines? Hey, Can’t Without W3C!

W3C Validation allows you to increase your SERP ranking for related keywords in search engines. But how? Let’s understand this relationship step by step:

  • Errors in your website’s source code prevent browsers from rendering or loading your site. They load it too slowly or can’t load at all.
  • Obstacles to rendering your site cause some of your content and pages not to be indexed in any way, while others result in extremely slow loading. Sometimes, web pages that do not load to achieve the look you intended create an interface that is not user-friendly.
  • HTML, XHTML, CSS files that do not follow the official rules and are considered invalid affect the performance of your site negatively. All metrics that are considered important when talking about Google Pagespeed experience a low score and the user who wants to get a good performance from your website will have to wait for a long time.
  • The bottom line is that Google or other search engines are less likely to rank you higher by saying “hey, there’s something great here for the user!” Instead, they will probably say ‘’hey, there is a problem decrease UX here!’’
  • So for technical SEO, we have to primarily care about W3C Validation, right?

Browser-Friendly Website or Leaving Your Business To Fate

The strong analytics of a website, reaching more people, and being visible depends primarily on its compatibility with browsers! But what browsers?

Well, let’s count the four important browser stars of recent times: Google Chrome, Firefox, Microsoft Edge, and Safari. The way to gain real visitors, and the way to make your visitors your permanent users, lies in making your website an atmosphere that can be accessed through these browsers in the highest quality. So our issue looks like SEO, right?

The improvements you will make in the code in the way of search engine optimization are an integral part of this whole. When you create a W3C certified website, no matter which browser users try to access your site, you will provide them with a flawless and error-free experience: There won’t be a single visitor missed!

Best Practices Is Only Possible With A Valid Code!

Listen to the Screpy experts: a code that doesn’t follow standards and doesn’t speak the language of search engines means red lights in Google Lighthouse

Applying a code that complies with the standards increases the possibility of implementing “best practices” in every field from web design to other SEO requirements. Because when creating a language with a common standard, the main purpose is to produce resources that can remain user-friendly for the long term and to support the visibility of these resources. So now we know the importance of W3C validity better.

The Voice of UX Comes From Somewhere: The User Is Only Happy With The Language Of The Browser!

There is only one tool between the end-user and your website that makes everything possible: the Browser! Therefore, speaking only in the language of the browser can allow it to see that there is an increase in UX while showing your content to the user. Let’s make it more clear:

  • In a website that has valid files, the user does not encounter an error when he or she navigates or takes an action on a page. This means a seamless web experience.
  • Valid code files can be immediately detected by the browser, scanned, and presented to the user. First of all, this means a strong web page in terms of page speed, and the strong effect of page speed on the user experience is powerful enough to reorder all parameters!
  • It’s not just the speed at which your website loads. A code source prepared in compliance with international standards also increases the flowing performance of your website. Consider how important the flowing experience can be, especially in multi-page sites such as e-commerce sites that are frequently experienced by clicking on different links!

Major User Group is on Mobile Devices You Can Reach with W3C!

The number of users who prefer internet access with their mobile devices is increasing day by day. Hey, data always tells the truth: While the rate of those who access the internet only with their mobile devices is 25 percent for America; It has reached 50 percent for Asia and Africa. How will you reach users on dozens of different mobile devices with different screen sizes, browsers, and operating systems? Let’s suppose you access, but how will you ensure a high UX for all?

Mobile devices bring internet access to “everywhere” and “every moment” for users. However, if your website’s performance on these devices is not strong, you may not be able to take advantage of these expanded possibilities. W3C Validation allows you to have mobile compatible (responsive) web pages.

Save Time and Energy: Valid Code Requires Less Maintenance

Using W3C valid code on your website means using code that can be easily rendered, edited, and re-evaluated. Therefore, periodic maintenance is required less, it takes less time to create a new page, and it is easier to use the same code structure on another website.

Find out where the problem is!

Consider how difficult it can be to manually scan a code. There are dozens of different factors that can cause your website to load slowly, certain areas to appear incorrect, or certain pages not to be loaded / rendered. Will you try to find out exactly where the problem is for each error by checking the code liner one by one?

With Screpy, there’s no need for that! Screpy analyzes each of the web pages you define separately. The pages you have saved to the system once are scanned periodically. In this way, it is possible to examine the warnings about all errors that have occurred or are found in terms of W3C validation on your website.

No searching for where the error is, just a quick optimization to boost your website!

Screpy, which you can use as a W3C Validation tool, saves you time and energy, allowing you to take the necessary steps faster for a user-oriented site.

A source code valid in terms of W3C also means that you can guarantee that people with disabilities can easily access your site.

Hey, this is extremely important both for search engines and for your service in countries that make up-to-date legal regulations on the internet usage rights of disabled people. A strong source code will ensure that you do not have problems in this regard.

How Screpy W3C Validator Works?

Screpy’s easy-to-use interface where you can track all your data, projects, and scores, now also works as a W3C validator. Verification basically means comparing your website’s source code to the W3C standards. For this, we use two basic validator tools provided by W3C and get perfect results: HTML validator and CSS validator!

  • Our HTML validator tool enables us to scan HTML and XHTML documents in the source code of your website. This scanning, which enables unnoticeable bugs and coding errors to be noticed immediately, shortens the optimization process and enables a stronger performance.
  • CSS validator performs detailed scanning to make sure your CSS files are renderable, compatible, and valid by browsers. In this way, you can be sure that your website is ready to be presented to the user as a whole!

Basically, the W3C validator can be used automatically by uploading a file, defining a URL, or using an HTML pasting. However, to perform the control process, it is necessary to use full HTML or full CSS document. For example, what is included in a standard HTML file?

  1. Doctype declaration
  2. Opening HTML element
  3. Head element and Title
  4. Opening and closing Body elements
  5. Closing HTML element

A full document containing all these is checked by W3C validation.

When To Perform W3C Validation? 

When you are going to implement W3C validation for your website, do it before you check its accessibility score. In order to remove all the obstacles in front of screen reader technologies to render your website, it is necessary to perform the validation process first. After making your HTML files and CSS files easily understandable by screen readers, do the screen reader testing and review the results.

What Happens If You Do Not Have Valid HTML?

If you do not perform the W3C validation, you may cause your website to encounter the following problems:

  1. First of all, your site will not be compatible with all of the most basic browsers. This means appealing to a narrower user base.
  2. Elements and contents on your site will load very slowly. This will mean a low SEO score, a high bounce rate, and of course a low UX.
  3. The displaying of your site may not be performed continuously. Not having a proper and consistent display can reduce the frequency of users choosing your site -decrease in website traffic.
  4. It can affect your ranking in search engines. Because remember, in order for a page to be indexed, it must first be rendered by the browser.
  5. Your website may not provide a robust browsing experience on mobile devices. This is a negative situation both in terms of UX and SEO score.

Frequently Asked Questions About W3C Validation

Have we gotten the W3C Validation logic? Fantastic! Would you like to take a quick look at the frequently asked questions now?

How do I check if HTML is correct?

With Screpy! Screpy checks whether your HTML, XHTML, and CSS files are valid and correct thanks to the powerful W3C Validation tools it uses. In this way, you have the chance to make goal-oriented optimizations.

What are some types of errors that a validator will help you find?

With W3C Validation, it is possible to detect the following problematic situations and more:

  1. Forgetting to convert special characters
  2. Having no doctype
  3. Missing / on self-closing elements
  4. An element forgotten to be closed
  5. Block elements inside inline elements
  6. Unencoded characters in URLs
  7. No ALT attribute added to images
  8. Starting a class or ID with a number
  9. Using attributes like “width” and “height”

Test Your Website Issues

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What W3C stand for?

WC3 means World Wide Web Consortium. This concept points to an international community and various researches and developments are made in order to develop Web standards. W3C is led by Web Inventor and Director Tim Berners-Lee and CEO Jeffrey Jaffe.

What is W3C Validation in SEO?

W3C validation checks whether your website and each individual web page have a code source that browsers can easily render and present to users. This is a goal of technical SEO and helps you have a browser-friendly website source code.

Why do we need a validator in CSS?

You need the validator not only for HTML and XHTML files but also for CSS files. CSS stands for Cascading Style Sheets and it checks whether such files are available on your site in accordance with web standards. Details such as table cells, the style, thickness, and color of a table’s border, and the padding around images on your website are directly CSS files, and their inability to be read by search engines means un-user-friendly, often unloaded web pages.