Skip to main content

CSS Id and Class

The id and class Selectors

In addition to setting a style for a HTML element, CSS allows you to specify your own selectors called "id" and "class".

The id Selector

The id selector is used to specify a style for a single, unique element.
The id selector uses the id attribute of the HTML element, and is defined with a "#".
The style rule below will be applied to the element with id="para1":

Example

#para1
{
text-align:center;
color:red;
}

Try it yourself »
Remark Do NOT start an ID name with a number! It will not work in Mozilla/Firefox.

The class Selector

The class selector is used to specify a style for a group of elements. Unlike the id selector, the class selector is most often used on several elements.
This allows you to set a particular style for many HTML elements with the same class.
The class selector uses the HTML class attribute, and is defined with a "."
In the example below, all HTML elements with class="center" will be center-aligned:

Example

.center {text-align:center;}

Try it yourself »
You can also specify that only specific HTML elements should be affected by a class.
In the example below, all p elements with class="center" will be center-aligned:

Example

p.center {text-align:center;}

Try it yourself »
Remark Do NOT start a class name with a number! This is only supported in Internet Explorer

Comments

Post a Comment

Popular posts from this blog

Toshiba Canada enters all-in-one PC market

Toshiba of Canada has thrown its hat into the all-in-one personal computer (PC) ring with the launch this week of the Toshiba DX730, a 23” all-in-one machine designed for users who want a large display and multimedia features in an environment where space is at a premium. It's Toshiba's first foray into this form factor, said Mini Saluja, national training manager with Toshiba of Canada, building on its experience in the laptop market. The DX730 has a 23” full HD multitouch display with a glossy black finish on an aluminum stand. It comes with a matching Bluetooth keyboard and mouse, and boasts Onkyo stereo speakers with Waves MaxxAudio sound processing. Two models of the DX730 will initially be available. The $899 model features a second-generation Intel Core i3 processor with 4GB of DDR3 memory, a 1TB 7200 RPM hard drive, a DVD SuperMulti Drive and HDMI in. For $1,049, you can move up to a model with an NVIDIA Geforce GT 540M processor and Intel Core i5, as we...
1 comment
Read more

Xiaomi Mi 11 Ultra review

  Introduction Now that the Pro moniker has gone mainstream, it's Ultra that has come to represent the cream of the crop, and the Xiaomi Mi 11 Ultra can wear that badge proudly. Limited to its home market last year, the ultimate Mi has gone global this time around, and we're happy to have it for review today. We're torn whether it's the camera system's physical appearance that is more striking or the hardware inside. A simply massive raised area on the back looks bolted on, almost after the fact, it's hard to miss, and it's a great conversation starter even if it's not everyone's cup of tea. But its size is warranted - the main camera packs the largest sensor used on a modern-day smartphone, and next to it - two more modules unmatched in their own fields, in one way or another. Oh, and yes, there's also a display here - because why not, but also because it can be useful. There's a lot more than 1.1 inches of ...
Post a Comment
Read more

JavaScript Where To

JavaScript in <body> The example below writes the current date into an existing <p> element when the page loads: Example <html> <body><h1>My First Web Page</h1> <p id="demo"></p> <script type="text/javascript"> document.getElementById("demo").innerHTML=Date(); </script> </body> </html>
Post a Comment
Read more