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  Hypertext Markup Language (HTML) is the standard markup language for documents designed to be displayed in a web browser. It can be assisted by technologies such as Cascading Style Sheets (CSS) and scripting languages such as JavaScript.

  Web browsers receive HTML documents from a web server or from local storage and render the documents into multimedia web pages. HTML describes the structure of a web page semantically and originally included cues for the appearance of the document.

  For more HTML knowledge, please click to link .

Wikipedia - HTML
Wikipedia - HTML instructions
HTML standard
W3C HTML Validation Service

1. Unintuitive error-handling behavior
  Certain invalid syntax constructs, when parsed, result in DOM trees that are highly unintuitive.

< table>< hr>...
2. Errors that can result in infoset coercion
  When a user agent based on XML is connected to an HTML parser, it is possible that certain invariants that XML enforces, such as element or attribute names never contain multiple colons, will be violated by an HTML file. Handling this can require that the parser coerce the HTML DOM into an XML-compatible infoset. Most syntax constructs that require such handling are considered invalid. (Comments containing two consecutive hyphens, or ending with a hyphen, are exceptions that are allowed in the HTML syntax.)

3. Cases where the author's intent is unclear
  Markup where the author's intent is very unclear is often made non-conforming. Correcting these errors early makes later maintenance easier.
For example, it is unclear whether the author intended the following to be an h1 heading or an h2 heading: < h1>Contact details< /h2>

4. Errors that could interfere with new syntax in the future
  In order to allow the language syntax to be extended in the future, certain otherwise harmless features are disallowed.

 Select the file on your computer and click the button to format it.

What is HTML?
HTML is the core foundational standard being worked on by the WHATWG community. It is continuously maintained and supersedes HTML4,XHTML1, DOM Level 2 HTML, and all previous HTML specifications — addressing many of the shortcomings of those specifications while at the same time enhancing HTML to more adequately cover the needs of web applications. Along with defining the HTML markup language, it also defines many of the core requirements that form the basis of the web runtime.

What is HTML5?
  Going forward, the WHATWG is just working on "HTML", without worrying about version numbers. When people talk about "HTML5" in the context of the WHATWG, they usually mean just "the latest work on HTML",not necessarily a specific version. For more details, see the section called " Is this HTML5? " in the standard.

How do I validate my pages?
 Use a validator .

For more HTML information, please see the HTML .

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