Lecture 41:- ID Selector

An ID selector in CSS is a type of selector that allows you to apply styles to a specific element with a unique id attribute. An ID selector is denoted by a hash (#) symbol followed by the id name.

For example, consider the following HTML code:

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<p id="special">This is a special paragraph.</p> <p>This is a normal paragraph.</p>

To style the first paragraph with an id of "special", you can use the following CSS code:

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#special {  background-color: yellow; }

The CSS selector #special matches the element with an id attribute of "special". In this case, the first paragraph will be styled with a yellow background. The second paragraph will not be affected because it does not have the id "special".

It is important to note that id selectors have a higher specificity than class selectors, meaning that if there is a conflict between a rule defined by an id selector and a rule defined by a class selector, the rule defined by the id selector will take precedence.

Additionally, id selectors should only be used to select a single unique element on a page. ID selectors should not be used to style multiple elements, as this can cause problems with the cascading nature of CSS. For this reason, it is generally recommended to use class selectors for styling multiple elements, and id selectors for unique elements or for linking to specific locations on a page.