5px

5px is a length value used in digital design to denote five CSS pixels. In CSS, px is a unit that maps to device pixels depending on the display's density. On standard displays, five CSS pixels correspond to roughly five physical pixels; on high-DPI screens, five CSS pixels may use more device pixels to render a crisper line. The precise rendering depends on the device's devicePixelRatio and the browser's rendering.

In practice, 5px is commonly used for borders, outlines, spacing, and layout dimensions. For example, a border-width of 5px creates a relatively thick edge; width or height set to 5px creates a very narrow element; margins and paddings of 5px produce spacing around content. In SVG, stroke-width can be specified in px such as 5px.

Rendering considerations: because CSS px are density-independent, the visual thickness varies with device density; some browsers support sub-pixel values like 0.5px for hairline borders on high-DPI displays, but support is not universal. If you need consistent appearance across devices, test on multiple screens.

Accessibility: using 5px for font sizes is generally not recommended; body text typically requires larger sizes for readability, and contrast should be sufficient. For lines or borders, 5px is a common choice to separate elements without appearing heavy.

See also: CSS pixel, devicePixelRatio, CSS length units, responsive design. In graphic design, 5 px denotes a stroke weight or line width measured in pixels.