A breakpoint is the specific screen width at which a responsive design's layout changes to better fit the available space.
Common Device-Based Breakpoints
Many designs use rough categories for phone, tablet, and desktop widths as a starting point, though actual device sizes vary enormously today.
Content-Driven Breakpoints Work Better
Rather than only targeting specific device sizes, resizing your own browser window and noting exactly where your specific content starts to look cramped or awkward often produces more genuinely useful breakpoints.
Testing Across Real Sizes
Since screen sizes vary continuously, checking your design at several widths — not just the standard three — catches awkward in-between states that specific device testing alone might miss.
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