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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


The HTML <i> Element represents a range of text that is set off from the normal text for some reason, for example, technical terms, foreign language phrases, or fictional character thoughts. It is typically displayed in italic type.
Element em font-style HTML HTML text-level semantics Reference Web


The HTML element <input> is used to create interactive controls for web-based forms in order to accept data from the user. How an <input> works varies considerably depending on the value of its type attribute.
Element Forms HTML HTML forms HTML input tag MakeBrowserAgnostic NeedsBrowserCompatibility NeedsMobileBrowserCompatibility Reference Web


The HTML <output> element represents the result of a calculation or user action.
Element HTML HTML forms HTML:Flow content HTML5 NeedsMobileBrowserCompatibility Reference Web


The HTML Strikethrough Element (<s>) renders text with a strikethrough, or a line through it. Use the <s> element to represent things that are no longer relevant or no longer accurate. However, <s> is not appropriate when indicating document edits; for that, use the <del> and <ins> elements, as appropriate.
Element HTML HTML text-level semantics NeedsNewBrowserCompatTable Reference text-decoration Web


The HTML Small Element (<small>) makes the text font size one size smaller (for example, from large to medium, or from small to x-small) down to the browser's minimum font size.  In HTML5, this element is repurposed to represent side-comments and small print, including copyright and legal text, independent of its styled presentation.
Element Élément font-size HTML HTML text-level semantics Reference Référence Web


The HTML <span> element is a generic inline container for phrasing content, which does not inherently represent anything. It can be used to group elements for styling purposes (using the class or id attributes), or because they share attribute values, such as lang. It should be used only when no other semantic element is appropriate. <span> is very much like a <div> element, but <div> is a block-level element whereas a <span> is an inline element.
Element HTML HTML text-level semantics HTML:Flow content Reference Web


The HTML Strong Element (<strong>) gives text strong importance, and is typically displayed in bold.
Element Élément font-weight HTML HTML text-level semantics Reference Référence Web


Use the  HTML <video> element to embed video content in a document. The video element contains one or more video sources. To specify a video source, use either the src attribute or the <source> element; the browser will choose the most suitable one.
Element HTML HTML embedded content HTML5 Media Multimedia NeedsMobileBrowserCompatibility Reference Web


The ::marker CSS pseudo-element represents the marker box of a list item (e.g. the bullet point or item number).
CSS CSS Lists and Counters CSS Pseudo-element Experimental Layout NeedsBrowserCompatibility NeedsExample NeedsMobileBrowserCompatibility Pseudo-element Reference Web

Using the Web Animations API

The Web Animations API lets us construct animations and control their playback with JavaScript. This article will start you off in the right direction with fun demos and tutorials featuring Alice in Wonderland.
Alice Animate animate Animations animations Beginner beginner CSS duration Guide JavaScript keyframes pause play reverse Timing Tutorial web animations api

File and Directory Entries API support in Firefox

The original File System API was created to let browsers implement support for accessing a sandboxed virtual file system on the user's storage device. Work to standardize the specification was abandoned back in 2012, but by that point, Google Chrome included its own implementation of the API. Over time, a number of popular sites and Web applications came to use it, often without providing any means of falling back to standard APIs or even checking to be sure the API is available before using it. Mozilla instead opted to implement other APIs which can be used to solve many of the same problems, such as IndexedDB; see the blog post Why no FileSystem API in Firefox? for more insights.
API Chrome Compatibility File and Directory Entries API File System API Files Firefox google google chrome Guide Offline offline Web Compatibility