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:
<!DOCTYPE html>
<html>
<head>
<title>Example Headings</title>
</head>
<body>
<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
<h4>Heading 4</h4>
<h5>Heading 5</h5>
<h6>Heading 6</h6>
</body>
</html>

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:
<h4>Example HTML with Comments</h4>
<!-- This is a comment, Start Menu -->
<ul>
 <li>Menu one</li>
 <li>Menu two</li>
</ul>
<!-- 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 Google Chrome browser, right-click on the page, then click View Page Source (or Ctrl+U).
- 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

HTML
CSS
JavaScript
PHP-MySQL
Which HTML5 tag defines marked text? (can be used to highlight parts of text)
<mark> <embed> <span>
<p>Free corses: <mark>coursesweb.net</mark> for Web Development.</p>
Which CSS pseudo-class adds a style to an element when the mouse is over it?
:focus :hover :active
a:hover {
  font-weight: bold;
  color: #00da01;
}
Click on the function which returns a string value that represents the number rounded to the x digits after the decimal point.
toPrecision(x) toFixed(x) floor(x)
var num = 12.34567;
num = num.toFixed(2);
alert(num);       // 12.35
Indicate the PHP function which reads an entire file into an array.
[) file() readfile()
$arr = file("a_file.txt", FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
var_export($arr);
HTML Headings and Comments

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