Safari的IndexedDB 50MB限额：按单域名还是设备总容量计算？

Great question—this is a common point of confusion with browser storage limits, so let’s break it down clearly:

The 50MB IndexedDB storage limit in Mobile Safari applies per individual domain, not as a total cap across all websites you visit.

To use your exact example:

• Mobile Safari will let facebook.com store up to 50MB of IndexedDB data
• It will also let spotify.com store a full, separate 50MB of IndexedDB data
• These limits are completely independent—one domain’s storage usage doesn’t eat into the allocation of another.

Also, keep in mind that all third-party browsers on iOS (like Chrome) are required to use Apple’s WebKit engine under the hood. That means they share the same per-domain 50MB IndexedDB limit as Mobile Safari.

If a site tries to go beyond its per-domain limit, the browser will usually prompt you to grant permission for increased storage on that specific site—though there’s no guarantee users will approve the request.

内容的提问来源于stack exchange，提问作者StuperUser