The ::first-line pseudo-element in CSS is used to style the first line of a block-level element. It allows you to apply styles specifically to the first line of text within an element, making it useful for typographic enhancements or creating decorative effects.

Syntax:

selector::first-line {
  /* Styles for the first line */
}

Features:

• Block-Level Elements Only: The ::first-line pseudo-element only works with block-level elements. It won’t have any effect on inline elements.
• Selection Limitations: The ::first-line pseudo-element allows styling only for the first line of text within a block. You cannot select specific words or characters within that line.
• Style Limitations: Some styles may not be applied to ::first-line. For example, properties like display, float, and position do not apply to ::first-line.