iPhone 18 Pro Screen Size & Viewport

Why this viewport matters

When a user visits your site on the iPhone 18 Pro, the browser reports window.innerWidth = 402 and window.devicePixelRatio = 3. Your CSS media queries match against the 402px CSS width, not the 1206 × 2622 physical pixel count of the panel.

At 402px it hits no Tailwind breakpoint (base styles only) and no Bootstrap breakpoint. Rotated to 874px it moves to Tailwind md, so check both orientations.

For sharp full-width images, serve a source at least 1206px wide (402 CSS px × 3 DPR) through srcset and let the browser pick it.

/* iPhone 18 Pro: 402×874 CSS px, DPR 3 */
@media (max-width: 402px) {
  /* styles for this width and narrower */
}

@media (min-resolution: 3dppx) {
  /* serve high-density assets */
}