Responsive web design is now a baseline expectation rather than a special feature. Most modern themes and builders can rearrange layouts for different screen sizes.
That does not automatically mean the mobile or tablet experience is good.
Check content priority, not just layout
A desktop page may have room for several messages at once. On a smaller screen, visitors encounter them sequentially. Decide which information needs to appear first instead of accepting the automatic stacking order.
Design for touch
Links, buttons, menus and form controls need enough space to use comfortably. Interactions that depend on hovering with a mouse may need a different approach on touch devices.
Protect readability
Text should remain comfortable to read without zooming. Long headings that work on desktop may dominate a phone screen, while very wide text blocks can become difficult to follow on larger displays.
Review images and media
Large images can affect performance and may crop badly at different aspect ratios. Use appropriate image sizes and check that important visual information is not lost when the layout changes.
Test forms and calls to action
A form that is simple on desktop can become tedious on a phone. Reduce unnecessary fields, use appropriate input types and make error messages easy to understand.
Test the actual journeys
Do not stop at checking whether the page ‘looks responsive’. Try the tasks your visitors need to complete: find information, make an enquiry, register, donate, book or download a document.
Responsive design is about continuity
The aim is to give people a clear, usable experience regardless of how they reach the website. Layout adaptation is part of that, but content, interaction and performance matter too.