1. A border or boundary between two regions, countries, or territories that changes or shifts over time due to political, legal, or natural circumstances
The variable border between the two nations was determined by seasonal water levels in the river.
A fronteira variável entre as duas nações era determinada pelos níveis sazonais de água no rio.
2. In design and web development, a border element whose properties (such as width, color, or style) can be changed dynamically
The CSS variable border allows the interface to adapt to different screen sizes.
A fronteira variável CSS permite que a interface se adapte a diferentes tamanhos de tela.