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CSS
.my-class {
color: red;
font-size: 16px;
}
<div class="my-class">This is a red text with a font size of 16px.</div>
CSS ID Selectors:
An ID selector targets a single element based on the value of its
idattribute.Each element can have only one unique ID.
ID selectors are denoted with a hash (
#) followed by the ID value.To apply an ID selector to an element, add the
idattribute to the HTML tag, like this:<div id="my-id">.To apply styles to an ID selector, use the selector followed by the CSS properties and values you want to apply.
Example:
#my-id {
color: blue;
font-size: 18px;
}
<div id="my-id">This is a blue text with a font size of 18px.</div>
Differences between Class and ID Selectors:
Multiple elements can share the same class, while each element can have only one unique ID.
Class selectors can target multiple elements, while ID selectors target a single, unique element.
Class selectors are typically used for styling groups of elements with shared characteristics, while ID selectors are often used to style specific, unique elements.
Class selectors are reusable and can be applied to multiple elements, whereas ID selectors are typically used for one specific element.
In terms of specificity, ID selectors have a higher specificity than class selectors, meaning an ID selector will override the styles of a class selector if there’s a conflict.
It’s generally recommended to use class selectors for styling elements unless there’s a specific need for unique identification, in which case ID selectors can be used. Proper use of class and ID selectors helps maintain separation of concerns, reusability, and specificity control in your CSS styles.
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