Mobile isn't a secondary version of your site anymore — for most businesses, it's the primary experience most visitors actually have.
Buttons and links need enough size and spacing to avoid frustrating mis-taps on a touchscreen.
Not just shrunk desktop layout — real mobile-first design accounts for how content flows on a narrow screen.
Mobile networks are often slower and less stable than the office wifi a site was likely tested on.
Appropriate input types (number pads for phone numbers, for example) reduce friction significantly on mobile specifically.
See how your own site scores on mobile.
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