15px
15px is a length value used in styling web pages. In CSS, 15px denotes fifteen CSS pixels, a unit defined by the CSS specification. CSS pixels are an abstract measure that maps to device pixels according to the display’s pixel density; on standard-density screens, a CSS pixel is roughly one device pixel, while on high-density screens a CSS pixel can correspond to multiple device pixels. This abstraction helps maintain consistent sizing across devices with different screen resolutions.
The 15px unit is commonly applied to font sizes, margins, padding, borders, and image dimensions. For example,
Because px is an absolute unit, its size does not automatically scale with the user’s base font
Cross-browser support for px values is universal, and 15px is widely accepted in modern web design. When