The HTML Validator tool is a web-based utility that checks the HTML code of a web page for errors and compliance with web standards.
When a user enters the URL of a web page into the HTML Validator tool, it retrieves the HTML code of that page and analyzes it for syntax errors, semantic errors, and non-compliance with web standards such as HTML5 and XHTML.
The HTML Validator tool highlights any errors or warnings in the HTML code and provides suggestions for how to fix them. It also displays information about the document type declaration, character encoding, and other metadata associated with the web page.
By using the HTML Validator tool, web developers and designers can ensure that their web pages are properly coded and comply with web standards, which can improve the accessibility, usability, and search engine optimization of their sites.