“Markup”

Topic Overview

Comments in HTML

Leaving Messages and Notes in HTML Adding HTML Comments TODO

Attributes

Review: HTML Elements and Tags Adding Attributes Revisit the Root Improving Document Structure TODO

Declaring Doctype

Review: DOCTYPE In the Past In the Now TODO

Head Elements

Review: The Head Meta Viewport Title Link Style Review: Head Elements TODO

Body Elements

Review: The Body Structural Markup Semantic Markup TODO

Semantic Markup

Bold and Strong Italic and Emphasis Superscript and Subscript Quotes and Blockquotes Abbreviations and Acronyms Citations Definitions Addresses Insert and Delete Strikethrough TODO

Lists

List Types Ordered Unordered Definitions Nested Lists TODO

External Hyperlinks

Hyperlinks and Hypertext Creating a Link Setting the Target Links to Other Sites E-mail Links TODO

Proper and Polite Code

Nobody Likes Rude Code 1. Logical or Linear Ordering 2. Properly Nested Tags 3. Indented Elements TODO

In the Past

In older versions of HTML and XHTML, the DOCTYPE included additional information on the page, as well as a reference link to the specification.

HTML

<!-- The DOCTYPE for HTML 4.01 looks like this: -->
<!DOCTYPE HTML PUBLIC"-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">


<!-- Here’s the DOCTYPE for XHTML 1.0: -->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict //EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

They’re not very human-readable, but, in their own way, they are simply saying “this document is written in HTML 4.01,” or “this document is written in XHTML 1.0.”

html doctype history