Hypertext Markup Language (HTML)
Hypertext Markup Language (HTML) is the standard markup language that is downloaded from a web server to a web browser and is used to display website and web application content.

HTML resources
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Mozilla's HTML page and introduction to HTML break down HTML by elements, metadata and forms before diving into more advanced web development topics.
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A few HTML tips is written for beginners who are learning HTML. The article gives guidance on common mistakes to avoid and what to do instead to write proper HTML.
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CodeAcademy's HTML basics course provides an interactive environment for learning the gist of the markup language.
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A list of everything that could go in the head of your document provides a comprehensive reference for elements that are required or optional in the
<head>element of your webpage. -
(Why) Some HTML is "optional" gives historical context for the
<p>paragraph element as an example to explain how HTML was originally designed. The backwards-compatibility remains because there is not enough optimization juice to squeeze from changing the implementation compared to the backwards-breaking changes in rendering existing sites. -
A Complete Guide to Links and Buttons extensively covers what might be thought of as a simple topic: the
aandbuttonelements in HTML, along with their many attributes and quirks. -
HTML: the inaccessible parts explains how even basic HTML elements can cause accessibility issues for screen readers and other devices that help people with impairments to use the web.