Can You Target HTML Elements with Numeric IDs Using CSS Selectors?

Can CSS Selectors Target Elements with Numeric IDs?

HTML5 allows IDs to contain solely digits, making them technically valid. However, using numeric IDs can present challenges when targeting them with CSS selectors.

Validity in HTML

Numeric IDs are not restricted by the HTML5 specification and are widely supported by browsers. They adhere to the rule that ID values must consist of non-whitespace characters.

Pitfalls with CSS Selectors

While IDs starting with numbers are valid in HTML, they cannot be utilized directly in CSS selectors. To circumvent this limitation, you need to escape the initial digit with a backslash (). For instance, to select an element with ID "12" in CSS, you would use #3132 (where 31 is the hexadecimal code for "1" and 32 for "2").

Workarounds

To avoid the complexity introduced by using numeric IDs in CSS selectors, consider starting IDs with letters. Alternatively, you can use JavaScript to manipulate elements based on their numeric IDs. JavaScript methods like document.getElementById and document.querySelector can target elements regardless of their ID format.

Example

The following code demonstrates working with an element having an ID that starts with a number:

<div>

Remember, while numeric IDs are technically acceptable in HTML, it's generally preferred to start IDs with letters for simplicity in CSS styling.

The above is the detailed content of Can You Target HTML Elements with Numeric IDs Using CSS Selectors?. For more information, please follow other related articles on the PHP Chinese website!