Phone · 320 px
iPad · 560 px
Amsterdam · responsive preview
The same self-contained article HTML, previewed at phone and tablet widths. Each frame is a live view of the real page — scroll inside a frame to read.
Phone · 320 px
iPad · 560 px
The page reflows automatically below 640 px — the phone frame shows the single-column mobile view, the iPad shows the wider layout. No separate mobile file: it is the same HTML responding to width.