Why you must test for mobile 📲
Google uses mobile-first indexing. This means Google predominantly uses the mobile version of your content for indexing and ranking. If your site is hard to read on a phone or lacks proper mobile tags, your desktop rankings will suffer.
What makes a site mobile-friendly?
- The Viewport Meta Tag: The single most important tag. It tells mobile browsers to scale the page to the width of the device, rather than zooming out to show the desktop version.
- Tap Targets: Buttons and links must be large enough (at least 48px) and spaced far enough apart to be tapped comfortably.
- Readable Font Sizes: Text should be at least 16px so it can be read without pinching and zooming.
- No Horizontal Scrolling: Content should fit within the width of the screen without forcing the user to scroll left and right.
Why do some sites show a blank screen?
Some websites use security headers like X-Frame-Options: DENY or Content-Security-Policy: frame-ancestors 'none'. These prevent other sites from loading them inside an iframe (to stop clickjacking). You can still test these by opening them in a new tab and resizing your browser window.