The <meta> tag provides information (or metadata) about the HTML document.
The <meta> tags should be placed within the head of the HTML document, they are not displayed on the page.
The "Meta" elements are generally used to enable search engines to determine the contents of your web pages and catalog them correctly.
There are many types of meta elements, which are specified by the "name" attribute. Here will be presented a few of them, the most useful meta-tags used for page indexing optimization in search engines.

<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
<title>Page title</title>
<meta name="description" content="A short phrase that describes the content of the page" />
<meta name="keywords" content="list of words, separated by, comma" />
<meta name="abstract" content="Short description of page" />
<meta name="language" content="es" />
<meta name="author" content="Author Name" />

The words in the <title> tag is better to be found in the "keywords" and "description" meta tags, also in the headings (<h1>, <h2>) of the page.

Here is an example of an HTML document with these meta-tags:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html lang="en" xml:lang="en" xmlns="">
 <meta http-equiv="content-type" content="text/html; charset=utf-8" />
 <title>Web courses HTML CSS PHP-MySQL JavaScript Ajax Flash</title>
 <meta name="language" content="en" />
 <meta name="description" content="Free online courses and tutorials for web developers: HTML, CSS, PHP-MySQL, JavaScript, Ajax and Flash" />
 <meta name="keywords" content="courses, html, css, php, mysql, javascript, ajax, flash" />
 <meta name="abstract" content="Free online courses and tutorials for web developers" />
 <meta name="author" content="MarPlo" />
   ... Contents that appear in the webpage ...

Meta redirect

The meta-redirect tag (meta refresh) cause the visitor's browser to load a new web page after a given number of seconds.
<meta http-equiv="refresh" content="4;url=" />
The code above will redirect the visitor to the "" page, after 4 seconds.
- Although setting the interval to 0 or a very short time will make the redirect almost undetectable but it is not advised b the 3WC because it can cause problems if the user hits the "Back" button.

Daily Test with Code Example

Which attribute is used in <a> tag for the address of the link?
src href rel
<a href="" title=""></a>
Which CSS property sets the type of the text font?
font-family text-decoration font-size
h2 {
What instruction selects all the <div> tags with class="cls"?
querySelector("div.cls") getElementsByTagName("div") querySelectorAll("div.cls")
var elm_list = document.querySelectorAll("div.cls");
var nr_elms = elm_list.length;       // number of selected items
Indicate the function that can be used to get the sum of values in an array.
array_sum() array_diff() array_shift()
$arr = array(1, 2, 3, 4);
$arr_sum = array_sum($arr);
echo $arr_sum;       // 10
HTML Meta tags for search engines

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