HTML Headings

HTML offers six levels of headings, using paired tags, from Heading 1 ( <h1> ... </h1> ) to Heading 6 ( <h6> ... </h6> ).
Each browser displays the headings in boldface, using its default font and descending font sizes, from Heading 1 (the biggest) to Heading 6 (the smallest).
- You can add CSS styles to change the Heading's font size, color, and other properties..

Use <h1>, <h2>, ..., for headings only.
Headings are important, search engines use document headings to index the structure and content of your web pages.

  - Example:
HTML codeDisplays in browser
<title>Document title</title>
<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
<h4>Heading 4</h4>
<h5>Heading 5</h5>
<h6>Heading 6</h6>
Heading 1
Heading 2
Heading 3
Heading 4
Heading 5
Heading 6

HTML Comments

Comments are used to insert notes into the document that are not displayed by the browser.
To add a comment, use the <!-- --> tag, placing the comment between the two pairs of dashes.
  - Example:
<!-- This is a comment, Start Menu -->
 <li>Menu one</li>
 <li>Menu two</li>
<!-- End Menu -->
Comments can be any length and are not restricted to one line.
Although browsers don't display comments when they display the web page, they can be viewed in the source code of the web page.
- To view the source code for the page currently displayed in Internet Explorer, click the Page drop-down menu, and then click View Source.
- To view the source code in Mozilla Firefox, click the View menu, and then click Page Source (or Ctrl+U).

Daily Test with Code Example

Which tag is used to add definition lists into a <dl> element?
<dt> <dd> <li>
  <dd> - Hyper Text Markup Language</dd>
  <dd> - Language for web pages</dd>
Which CSS property can hide an element on page, letting an empty space in its place?
display position visibility
#id {
  visibility: hidden;
Click on the event which is triggered when the mouse clicks on an object.
onclick onmouseover onfocus
document.getElementById("id").onclick = function(){
Indicate the PHP variable that contains the contents of both $_GET, $_POST, and $_COOKIE arrays.
if(isset($_REQUEST["id"])) {
  echo $_REQUEST["id"];
HTML Headings and Comments

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