How do I style an ID in CSS?

A CSS ID selector uses the ID attribute of an HTML element to select one unique element on a page. To use an ID selector in CSS, you simply write a hashtag (#) followed by the ID of the element. Then put the style properties you want to apply to the element in brackets.

Can an ID be a number CSS?

Since HTML5 it’s been valid to start an HTML element ID with a number. That’s because even though HTML5 is quite happy for an ID to start with a number, CSS is not. CSS simply doesn’t allow selectors to begin with a number.

Can I use ID and class in CSS?

You Can Use Both ID and CSS Class Selectors There are no rules in HTML that prevent you from assigning an element both an ID and a class. This tag will be subject to the styles for the class backgroundOrange . In addition, it will also use the styles applied to the customDiv ID using an ID selector.

How do I select HTML element based on id attribute?

Using the Attribute Selector. In this section, you will use the attribute selector to find and select an element. In the previous sections, you have learned that the id and class selectors have a symbol indicating the kind of attribute to target followed by a value to select.

How do I identify an ID in CSS?

In the CSS, a class selector is a name preceded by a full stop (“.”) and an ID selector is a name preceded by a hash character (“#”). The difference between an ID and a class is that an ID can be used to identify one element, whereas a class can be used to identify more than one.

What is a ID selector?

The CSS ID selector matches an element based on the value of the element’s id attribute. In order for the element to be selected, its id attribute must match exactly the value given in the selector.

Can DIVS have id?

8 Answers. Can I have a div with id as number? Yes, you can. id values that consist solely of digits are perfectly valid in HTML; anything but a space is okay.

Can classname be number?

HTML5 supports numbers as id and class name , but css selector have some rules , A valid name should start with a letter (a-z)[A-Z] , an underscore (_), or a hyphen (-) which is followed by any numbers, hyphens, underscores, letters.

What is the use of ID in CSS?

What are the 3 types of selecting a HTML element?


  • form.
  • fieldset.
  • legend.
  • label.
  • input.
  • button.
  • select.
  • datalist.