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How to Check the HTML Code for Errors

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How to Check the HTML Code for Errors

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Errors in HTML code create a ton of problems: search engines refuse to promote the site, and users sadly close the browser tab because nothing works. Professional programmers always check the code for errors and find them in seconds. It helps them understand if their sites work as properly as sports online betting.

Here’s how to check the site by yourself and what will happen to it if the code is invalid.

What Is HTML Validation and Why Is It Needed?

Validation is a check for HTML code: to make sure it conforms to commonly accepted rules and is free of errors. Good code is called valid code. It loads quickly, browsers process its syntax correctly, search engines think the site is just fine, and its positions rise.

Standards for code quality were invented and maintained by the W3C. The W3C proposes to unify sites: to make them fast, equally usable and accessible to all.

What Are the Dangers of Errors in Markup

Errors spoil the impression of the site, preventing him from working properly and promotion in search engines.

Here are specific examples:

●Pages load too slowly. According to Unbounce, nearly 27% of users close a page if it loads more than three seconds. Another 32.3% leave after six seconds of loading.

●Visitors see only part of the text and illustrations. This means that the content is almost useless to them – and the visitor is likely to leave for a competitor.

●If a search robot stumbles on at least one error – a broken link, missing a mark in the code or incorrect layout – it cannot index the page.

●The site doesn’t display correctly on different devices. It may look good on the computer screen, but with a phone won’t be visible texts, buttons or all the content “moves away”.

●The site has a lot of hidden advertising and viruses, and the developer or owner of the site isn’t aware of them.

As a result, the user can’t normally interact with the site and closes the browser tab. The site loses a visitor and the search engine notices the deterioration of behavioral factors and lowers positions in search results.

Why Errors Appear in the Code

Errors in the markup appear if the developer, for example, forgot to close the tag, accidentally duplicated an element or indicated the wrong attribute.

In valid code, there are no unnecessary brackets or punctuation, but it’s difficult to keep track of everything yourself. That’s why we invented the validator, which helps find all errors in a few seconds.

How to Use the Validator

Validator is a service that checks the validity of HTML, which quickly finds errors in code and helps fix them. There are several similar services, but developers often use the official W3C validator. There are three ways to find errors in it: specify a site URL, upload an HTML document, or HTML code.

The validator won’t make the site perfect, but it will help get rid of errors that interfere with users, browsers and search engines.

What the Validator Checks

The service checks the code syntax: e.g. if the document type and encoding are specified correctly if there are no missing elements in the code. It also checks for DTD (Document Type Definition) compliance – the validator looks to see if the code matches the document type.

The DTD is an instruction to the browser that helps it display the HTML document correctly.

How to Interpret the Result

The validator divides problematic parts of the code into warnings and errors. For convenience, they are highlighted in different colors to make it clear at a glance which problems deserve special attention.


Minor problems. The site is probably not broken but still doesn’t meet W3C specifications.

This means that all other things being equal, competitors’ sites will perform better on different devices and promote themselves more effectively in search engines.


Serious problems. There is a risk that the site will be displayed incorrectly, some of the content will be hidden, or the user won’t be able to view the pages at all.

Errors should be fixed first, but it’s a good practice to get rid of all problems altogether: this will help the site to work properly. 

How to Check Your Layout With Hinter

Hinter is a tool that highlights problematic syntax right in the code editor.

You can check the layout while the site is being developed. Hinter will help you by highlighting problematic elements while you are writing code.

Typically, a hinter looks like a plugin for the text editor in which you write code. It’s like the spell checker in Word, only for HTML and CSS.


Before you submit your site to a customer or publish it on the Internet, you should check the code for validity. What you need to remember:

●Code is valid and invalid. You need a valid code.

●It can be difficult to achieve validity, even for an experienced developer, because there is a lot of code. Professionals use a validator.

●A validator can check a site, an HTML document, or a piece of code.

●A site with good code is better promoted in search engines and pleases users with speed and functionality, no matter what device they enter from.


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