Pseudo-elements in CSS are used to style specific parts of an element. They can be used to add special effects to some selectors. Some commonly used pseudo-elements are ::before, ::after, ::first-letter, ::first-line, ::selection, ::backdrop, and ::marker.
The sx property in Chakra UI provides a powerful way to extend the use of CSS within your components. It allows you to apply custom CSS styles directly to a Chakra UI component using an inline syntax, without the need to write separate CSS files or define additional classes.
The sx property in Chakra UI becomes particularly useful when working with pseudo props. With the sx property, you can easily define styles for these pseudo props inline, providing a convenient and concise way to handle state-based styling within your components.
To import the Box component used below:
::before and ::after: These pseudo-elements can be used to add decorative elements or extra content to your component. In this example, the ::before pseudo-element is used to add a star before the content of the Box. We use position: "absolcontent star relative to the Box. We also use the content property to include the star character.
::first-letter: This pseudo-element can be used to style the first letter of your component. In the following example, the ::first-letter pseudo-element is used to style the first letter of the text inside the Box first letter is made larger and colored deeppink.
::first-line: This pseudo-element can be used to style the first line of your component. In the following example, the ::first-line pseudo-element is used to style the first line of the text inside the Box. The first line is made bold and colored cyan.
::selection: This pseudo-element can be used to style the selected text inside your component. In the following example, the ::selection pseudo-element is used to style the selected text inside the Box. The selected text is given acyan background.
::placeholder can be used to style placeholder text of an input field. This can be used with Chakra UI's Input component. In the following example, the ::placeholder pseudo-element is used to style the placeholder text of the input field. The placeholder text color is changed to blue and the font style is set to italic. This is a useful feature that allows you to customize the appearance of the placeholder text, which can help to achieve a more integrated and visually pleasing user interface.
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