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The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.
While client-side languages used in conjunction with forms are limited, they often can serve to do pre-validation of the form data and/or to prepare the form data to send to a server-side program. This usage is being replaced, however, by HTML5 's new input field types and required attribute.
The two specifications were later merged to form HTML5. [16] The HTML5 specification was adopted as the starting point of the work of the new HTML working group of the W3C in 2007. WHATWG's Ian Hickson and David Hyatt produced W3C's first public working draft of the specification on 22 January 2008. [2]
This section gives examples of diagnostics generated by the markup validation service, and suggests possible fixes. Diagnostics are by line and column of the generated HTML for the page. It may be helpful to obtain the HTML in order to understand the diagnostic. For example, if you using the Firefox browser, you can type control-U to see the HTML.
An HTML browser or other agent can infer the closure for the end of an element from the context and the structural rules defined by the HTML standard. These rules are complex and not widely understood by most HTML authors. The general form of an HTML element is therefore: < tag attribute1 = "value1" attribute2 = "value2" > ''content'' </ tag >.
CSS HTML Validator is developed, marketed, and sold by AI Internet Solutions LLC located in Texas. [1] The first version of CSS HTML Validator was released in 1997 for Windows 95. The current version is 2024/v24.03 [2] (as of June 24, 2024) and is for Windows 10 and above, including Windows 11.
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The Legacy DOM enabled client-side form validation and simple interface interactivity like creating tooltips. In 1997, Netscape and Microsoft released version 4.0 of Netscape Navigator and Internet Explorer respectively, adding support for Dynamic HTML (DHTML) functionality enabling changes to a loaded HTML document. DHTML required extensions ...