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CSS Syntax

A CSS rule-set consists of a selector and a declaration block:

The selector points to the HTML element you want to style.

The declaration block contains one or more declarations separated by semicolons.

Each declaration includes a CSS property name and a value, separated by a colon.

A CSS declaration always ends with a semicolon, and declaration blocks are surrounded by curly braces.

In the following example all <p> elements will be center-aligned, with a red text color:Example:

<!DOCTYPE html>
<html>
<head>
<style>
p {
color: red;
text-align: center;
}
</style>
</head>
<body>

<p>Hello World!</p>
<p>These paragraphs are styled with CSS.</p>

</body>
</html>

CSS Selectors

CSS selectors are used to "find" (or select) HTML elements based on their element name, id, class, attribute, and more.

The element Selector

The element selector selects elements based on the element name.

You can select all <p> elements on a page like this (in this case, all <p> elements will be center-aligned, with a red text color):

The id Selector

The id selector uses the id attribute of an HTML element to select a specific element.

The id of an element should be unique within a page, so the id selector is used to select one unique element!

To select an element with a specific id, write a hash (#) character, followed by the id of the element.

The style rule below will be applied to the HTML element with id="para1":

Example:

<!DOCTYPE html>

<html>

<head>

<style>

#para1 {

text-align: center;

color: red;

}

</style>

</head>

<body>

<p id="para1">Hello World!</p>

<p>This paragraph is not affected by the style.</p>

</body>

</html>

The class Selector

The class selector selects elements with a specific class attribute.

To select elements with a specific class, write a period (.) character, followed by the name of the class.

In the example below, all HTML elements with class="center" will be red and center-aligned: Example:

<!DOCTYPE html>

<html>

<head>

<style>

.center {

text-align: center;

color: red;

}

</style>

</head>

<body>

<h1 class="center">Red and center-aligned heading</h1>

<p class="center">Red and center-aligned paragraph.</p>

</body>

</html>

The HTML <script> Tag

The <script> tag is used to define a client-side script (JavaScript).

The <script> element either contains scripting statements, or it points to an external script file through the src attribute.

Common uses for JavaScript are image manipulation, form validation, and dynamic changes of content.

To select an HTML element, JavaScript very often use the document.getElementById(id) method.

This JavaScript example writes "Hello JavaScript!" into an HTML element with id="demo":Example:

<!DOCTYPE html>

<html>

<body>

document.getElementById("demo").innerHTML = "Hello JavaScript!";

</script>

</body>

</html>

The HTML <noscript> Tag

The <noscript> tag is used to provide an alternate content for users that have disabled scripts in their browser or have a browser that doesn't support client-side scripts:Example:

<!DOCTYPE html>

<html>

<body>

document.getElementById("demo").innerHTML = "Hello JavaScript!";

</script>

<p>A browser without support for JavaScript will show the text written inside the noscript element.</p>

</body>

</html>

Also Example:

<!DOCTYPE html>

<html>

<body>

function light(sw) {

var pic;

if (sw == 0) {

pic = "pic_bulboff.gif"

} else {

pic = "pic_bulbon.gif"

}

document.getElementById('myImage').src = pic;

}

</script>

<p>

<button type="button" onclick="light(1)">Light On</button>

<button type="button" onclick="light(0)">Light Off</button>

</p>

</body>

</html>

Styling HTML with CSS

CSS stands for Cascading Style Sheets.

CSS describes how HTML elements are to be displayed on screen, paper, or in other media.

CSS saves a lot of work. It can control the layout of multiple web pages all at once.

CSS can be added to HTML elements in 3 ways:

Inline - by using the style attribute in HTML elements
Internal - by using a <style> element in the <head> section
External - by using an external CSS file

The most common way to add CSS, is to keep the styles in separate CSS files. However, here we will use inline and internal styling, because this is easier to demonstrate, and easier for you to try it yourself.

Inline CSS

An inline CSS is used to apply a unique style to a single HTML element.

An inline CSS uses the style attribute of an HTML element.

This example sets the text color of the <h1> element to blue.Example:

<!DOCTYPE html>

<html>

<body>

<h1 style="color:blue;">This is a Blue Heading</h1>

</body>

</html>

Internal CSS

An internal CSS is used to define a style for a single HTML page.

An internal CSS is defined in the <head> section of an HTML page, within a <style> element:

<!DOCTYPE html>

<html>

<head>

<style>

body {background-color: powderblue;}

h1 {color: blue;}

p {color: red;}

</style>

</head>

<body>

<h1>This is a heading</h1>

<p>This is a paragraph.</p>

</body>

</html>

External CSS

An external style sheet is used to define the style for many HTML pages.

With an external style sheet, you can change the look of an entire web site, by changing one file!

To use an external style sheet, add a link to it in the <head> section of the HTML page:

<!DOCTYPE html>

<html>

<head>

</head>

<body>

<h1>This is a heading</h1>

<p>This is a paragraph.</p>

</body>

</html>

HTML text TAGS

HTML TAGS EXAMPLES

Heading tags
Heading tags is use for creating heading in pages. There are six heading tags. For example.
<H1> Head 1 </H1>
<H2> Head 1 </H2>
<H3> Head 1 </H3>
<H4> Head 1 </H4>
<H5> Head 1 </H5>
<H6> Head 1 </H6>

2. Paragrah

Paragraph tag is use for writing paragraph.

For example.

<p> There is a paragraph </p>

3. Link tag

Link tag use for link one page to another page. In link tag we use a attribute (href). For example.

<a href="http://www.google.com"> Google </a>

4. Image tag

Image tag is use for show image in web page. In image tag we us attribute of src. For image tag we know the name and extantion of image.img tag we also use height and width attributes. For example.

<img src="Google.png" height="100" width="100

Computer And It

CSS Syntax

CSS Syntax

CSS Selectors

The element Selector

The id Selector

The class Selector

The HTML script Tag

The HTML <script> Tag

The HTML <noscript> Tag

Styling HTML with CSS

Styling HTML with CSS

Inline CSS

Internal CSS

External CSS

HTML text TAGS

HTML TAGS EXAMPLES

Heading tags
Heading tags is use for creating heading in pages. There are six heading tags. For example.
<H1> Head 1 </H1>
<H2> Head 1 </H2>
<H3> Head 1 </H3>
<H4> Head 1 </H4>
<H5> Head 1 </H5>
<H6> Head 1 </H6>

2. Paragrah

3. Link tag

4. Image tag

introduction of computer

Latest Reviews

CSS Syntax

CSS Syntax

CSS Selectors

The element Selector

The id Selector

The class Selector

The HTML script Tag

The HTML <script> Tag

The HTML <noscript> Tag

Styling HTML with CSS

Styling HTML with CSS

Inline CSS

Internal CSS

External CSS

HTML text TAGS

HTML TAGS EXAMPLES

Heading tags Heading tags is use for creating heading in pages. There are six heading tags. For example.<H1> Head 1 </H1><H2> Head 1 </H2><H3> Head 1 </H3><H4> Head 1 </H4><H5> Head 1 </H5><H6> Head 1 </H6>

2. Paragrah

3. Link tag

4. Image tag

introduction of computer

Heading tags
Heading tags is use for creating heading in pages. There are six heading tags. For example.
<H1> Head 1 </H1>
<H2> Head 1 </H2>
<H3> Head 1 </H3>
<H4> Head 1 </H4>
<H5> Head 1 </H5>
<H6> Head 1 </H6>