CSS Reference Guide: border

The CSS border property is a shorthand method used to define the width, style, and color of an element's border, which is part of the CSS box model and does not extend into the element's margins. Users can specify these attributes using various shorthand and explicit syntax, such as in "border: 1px solid green," where the width is 1px, the style is solid, and the color is green. If only one or two properties are defined, CSS assigns default values, typically setting the width to medium (approximately 3px) and the color to black unless an element's or its parent's color property is defined. The border-style property offers multiple values like solid, dotted, and dashed, and can be applied individually to each side of an element's border. Additionally, border-width can be set using specific values like thin, medium, and thick, although these are not strictly defined and can vary by implementation. Overall, the border property provides a flexible way to enhance the visual presentation of web elements, while tools like LogRocket can assist developers in monitoring and optimizing frontend performance.