How do I validate my HTML code?

In order to validate your code, you have to declare the standard to which it adheres. To describe the HTML standard (the document type declaration, DTD), the file should contain a DOCTYPE declaration (before the HTML code). Here are a few examples (from

How do I check if HTML is correct?

The World Wide Web Consortium provide a simple online tool ( that automatically check your HTML code and point out any problems/errors your code might have, such as missing closing tags or missing quotes around attributes.

How do you validate W3C standards?

The best way to validate your code is by using the W3C validation tools. CSS Validator: This validator checks the CSS validity of web documents in HTML, XHTML etc. There are plenty of browser extensions that will test the page you’re viewing against the W3C validators.

How do I see HTML errors?

Open the HTML file that you’d like to check for errors….Invoke ” HTML Tidy ” by:

  1. Clicking the ” HTML Tidy ” icon on the ” Tools ” tab, or.
  2. Selecting ” Actions | Tools | HTML Tidy ” from the main menu, or.
  3. Pressing the ” F9 ” key.

What is validation in HTML?

An HTML validator is a quality assurance program used to check Hypertext Markup Language ( HTML ) markup elements for syntax errors. A validator can be a useful tool for an HTML user who receives data electronically from a variety of input sources.

How do you validate a website?

Web site validation techniques to try

  1. Go to the W3C validator website.
  2. Type in your website address.
  3. Click to Check.
  4. Look at the results! If it gives you a green ‘success’ page then well done, if not then you will need to do a little work.

How do I validate HTML5?

The simplest HTML5 validation feature is the required attribute. To make an input mandatory, add this attribute to the element. When this attribute is set, the element matches the :required UI pseudo-class and the form won’t submit, displaying an error message on submission when the input is empty.

Can we debug HTML code?

Writing HTML is fine, but what if something goes wrong, and you can’t work out where the error in the code is? This article will introduce you to some tools that can help you find and fix errors in HTML. Learn the basics of using debugging tools to find problems in HTML. …

Where is HTML error code in Chrome?

5 Answers. Another options is to use the W3C validator “favelets” to open the W3C validator from a bookmark.

What is a W3C validator?

The Markup Validator is a free service by W3C that helps check the validity of Web documents. Most Web documents are written using markup languages, such as HTML or XHTML . These languages are defined by technical specifications, which usually include a machine-readable formal grammar (and vocabulary).

How do you test your HTML code?

Cut and paste or type your HTML to be tested into the text box below. Then click the Test the HTML Code button. It will open a new window so that you can see the results of your code. The testing process will also test various scripts that are legal in HTML. You must include full URLs to test the validity of links and graphics.

What is a valid HTML?

Valid HTML follows the grammar, vocabulary and syntax of the HTML language. The process of checking a web document for HTML errors is known as “HTML validation”.