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<select>

The HTML select (<select>) element represents a control that presents a menu of options. The options within the menu are represented by <option> elements, which can be grouped by <optgroup> elements. Options can be pre-selected for the user.
Element Forms HTML HTML forms Reference Web

<style>

The HTML <style> element contains style information for a document, or part of a document. By default, the style instructions written inside that element are expected to be CSS.
Element HTML HTML document metadata Reference Web

<summary>

The HTML summary element (<summary>) is used as a summary, caption, or legend for the content of a <details> element.
Element HTML HTML interactive elements Reference Web

<textarea>

The HTML <textarea> element represents a multi-line plain-text editing control.
Element Forms HTML HTML forms Reference Web

<title>

The HTML <title> element defines the title of the document, shown in a browser's title bar or on the page's tab. It can only contain text, and any contained tags are ignored.
Element HTML HTML document metadata Reference Web

<ul>

The HTML <ul> element (or HTML Unordered List Element) represents an unordered list of items, namely a collection of items that do not have a numerical ordering, and their order in the list is meaningless. Typically, unordered-list items are displayed with a bullet, which can be of several forms, like a dot, a circle or a squared. The bullet style is not defined in the HTML description of the page, but in its associated CSS, using the list-style-type property.
Element HTML HTML grouping content Reference

Optimizing your pages for speculative parsing

Traditionally in browsers the HTML parser has run on the main thread and has blocked after a </script> tag until the script has been retrieved from the network and executed. The HTML parser in Firefox 4 and later supports speculative parsing off the main thread. It parses ahead while scripts are being downloaded and executed. As in Firefox 3.5 and 3.6, the HTML parser starts speculative loads for scripts, style sheets and images it finds ahead in the stream. However, in Firefox 4 and later the HTML parser also runs the HTML tree construction algorithm speculatively. The upside is that when a speculation succeeds, there's no need to reparse the part of the incoming file that was already scanned for scripts, style sheets and images. The downside is that there's more work lost when the speculation fails.
Advanced HTML HTML5 NeedsUpdate Web Development

Traversing an HTML table with JavaScript and DOM Interfaces

This article is an overview of some powerful, fundamental DOM level 1 methods and how to use them from JavaScript. You will learn how to create, access and control, and remove HTML elements dynamically. The DOM methods presented here are not specific to HTML; they also apply to XML. The demonstrations provided here will work fine in any modern browser, including all versions of Firefox and IE 5+.
DOM Guide HTML JavaScript

volume

The HTMLMediaElement.volume property sets the volume at which the media will be played. 
HTML Media Element

NavigatorOnLine

The NavigatorOnLine interface contains methods and properties related to the connectivity status of the browser.
API HTML-DOM

Node.baseURI

The Node.baseURI read-only property returns the absolute base URL of a node.
API HTML Property

Writing a WebSocket server in C#

If you would like to use the WebSocket API, it is useful if you have a server. In this article I will show you how to write one in C#. You can do it in any server-side language, but to keep things simple and more understandable, I chose Microsoft's language.
HTML5 NeedsMarkupWork Tutorial WebSockets

<b>

The HTML <b> Element represents a span of text stylistically different from normal text, without conveying any special importance or relevance. It is typically used for keywords in a summary, product names in a review, or other spans of text whose typical presentation would be boldfaced. Another example of its use is to mark the lead sentence of each paragraph of an article.
Element HTML HTML text-level semantics HTML:Flow content HTML:Phrasing content Reference Web

<image>

The HTML <image> element was an experimental element designed to display pictures. It never was implemented and the standard <img> element must be used.
HTML Non-standard

<input type="checkbox">

The HTML input element <input type="checkbox"> is an input element to enter an array of different values. The value attribute is used to define the value submitted by the checkbox. The checked attribute is used to indicate whether this item is selected. The indeterminate attribute is used to indicate that the checkbox is in an indeterminate state (on most platforms, this draws a horizontal line across the checkbox).
Element HTML Reference

<input type="color">

The <input type="color"> element is a specific version of the <input> element, used to create an input field which allow user to select color and enter color code. A color picker's UI has no required features other than accepting simple colors as text (more info).
Element HTML Reference

<input type="datetime">

The HTML <input type="datetime"> is a control for entering a date and time (hour, minute, second, and fraction of a second) based on the UTC time zone.
Element HTML Reference

<input type="image">

The <input type="image"> is a graphical submit button. You must use the src attribute to define the source of the image and the alt attribute to define alternative text. The height and width attributes are used to define the size of the image in pixels.
Element HTML Reference

<input type="password">

The HTML <input type="password"> element is a specific version of the <input> element, used to create an input field accepting a password.
Element HTML Reference