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The W3C Markup Validation Service

The W3C Markup Validation Service

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HTML attribute reference - HTML (HyperText Markup Language) Elements in HTML have attributes; these are additional values that configure the elements or adjust their behavior in various ways to meet the criteria the users want. Attribute list Content versus IDL attributes In HTML, most attributes have two faces: the content attribute and the IDL attribute. Is Google Making Us Stupid? Illustration by Guy Billout "Dave, stop. Stop, will you? Stop, Dave. Will you stop, Dave?” So the supercomputer HAL pleads with the implacable astronaut Dave Bowman in a famous and weirdly poignant scene toward the end of Stanley Kubrick’s 2001: A Space Odyssey.

HTML element reference - HTML This page lists all the HTML elements. They are grouped by function to help you find what you have in mind easily. Although this guide is written for those who are newer to coding, we intend it to be useful for anyone. Basic elementsEdit A Complete Guide to Flexbox Background The Flexbox Layout (Flexible Box) module (currently a W3C Last Call Working Draft) aims at providing a more efficient way to lay out, align and distribute space among items in a container, even when their size is unknown and/or dynamic (thus the word "flex"). The main idea behind the flex layout is to give the container the ability to alter its items' width/height (and order) to best fill the available space (mostly to accommodate to all kind of display devices and screen sizes). A flex container expands items to fill available free space, or shrinks them to prevent overflow. Most importantly, the flexbox layout is direction-agnostic as opposed to the regular layouts (block which is vertically-based and inline which is horizontally-based). While those work well for pages, they lack flexibility (no pun intended) to support large or complex applications (especially when it comes to orientation changing, resizing, stretching, shrinking, etc.).

You can still use div “Sorry, can you say that again?”, I hear you ask. Certainly: you can still use <div>! Despite HTML5 bringing us new elements like <article>, <section>, and <aside>, the <div> element still has its place. Let the HTML5 Doctor tell you why. Status: Unchanged Beginner Concepts: How CSS Selectors Work Are you new to CSS? This article is for you! Perhaps the biggest key to understanding CSS is understanding selectors. Selectors are what allows you to target specific HTML elements and apply style to them. Let's not think about style right now though, let's just focus on the selecting. In the examples below, the CSS would be in a file called something like style.css that is referenced from an HTML document called something like index.html.

HTML Glossary class HTML elements can have one or more classes, separated by spaces. You can style elements using CSS by selecting them with their classes. Example Intro to HTML and CSS Thank you for signing up for the course! We look forward to working with you and hearing your feedback in our forums. Need help getting started? Web Forms You are here: Home Dive Into HTML5 Diving In Everybody knows about web forms, right? Make a <form>, a few <input type="text"> elements, maybe an <input type="password">, finish it off with an <input type="submit"> button, and you’re done. You don’t know the half of it.

Udacity Nanodegree Style Guide Document Type Use HTML5. HTML5 (HTML syntax) is preferred for all HTML documents: <!DOCTYPE html>. Do not close self-closing elements, ie. write <br>, not <br />. HTML Validity Using HTML sections and outlines - Web developer guides Important: There are currently no known implementations of the outline algorithm in graphical browsers or assistive technology user agents, although the algorithm is implemented in other software such as conformance checkers. Therefore the outline algorithm cannot be relied upon to convey document structure to users. Authors are advised to use heading rank (h1-h6) to convey document structure. The HTML5 specification brings several new elements to web developers allowing them to describe the structure of a web document with standard semantics. This document describes these elements and how to use them to define the desired outline for any document. Structure of a document in HTML 4Edit

Web technology for developers The open Web presents incredible opportunities for developers. To take full advantage of these technologies, you need to know how to use them. Below you'll find the links to MDN's documentation on Web technologies. Web technologies Basics