To validate your XHTML: Go to to Validate Your Code

1. Choose Validate by File Upload.
2. Click Browse and find your XHTML file on your local computer’s hard drive.
3. Select your XHTML file (remember, it must have the . html extension) and click Open.
4. Click the Check button on the validator.

What is XHTML validation?

Advertisements. Every XHTML document is validated against a Document Type Definition. Before validating an XHTML file properly, a correct DTD must be added as the first or second line of the file. Once you are ready to validate your XHTML document, you can use W3C Validator to validate your document.

What are at least 2 types of files that can be validated using the validators provided by W3C?

The W3C Markup Validation Service by the World Wide Web Consortium allows you to validate HTML and XHTML files by URI, by file upload and by direct input of complete HTML or XHTML documents.

How do I validate XHTML documents online?

Fortunately, the W3C provides a free online validation service known as the W3C Validator that can be used to validate XHTML documents. This validation service is available online at and is shown in Figure 21.1.

How do I validate xhtml documents online?

What is xhtml strict?

As of November 2015, XHTML 1.0 Strict is the document type used for the homepage of the website of the World Wide Web Consortium. XHTML 1.0 Transitional is the XML equivalent of HTML 4.01 Transitional, and includes the presentational elements (such as center , font and strike ) excluded from the strict version.

What does w3 validator check?

This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available.

How do I make HTML validation?

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.

What is HTML validation?

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.