cache key · partitioning

The same image, requested from the iframe and from the parent page

Browser
Between requests
https://siteb.com/
siteb.com parent page · top-level

<img src="https://imageurl.com/myImage.jpg">

sitea.com iframe · cross-site

<img src="https://imageurl.com/myImage.jpg">

Cache key of the last request Nothing requested yet.

HTTP cache · stored partitions

The cache is empty.

Network panel

NameInitiatorSize
No requests.
requests
0
to network
0
bytes transferred
0 kB

Request the image from the iframe, then from the parent page. Switch browsers to see how the outcome changes, or evict the entry between the two requests.

This is a simulation. No network request is made and the real cache is never touched: the outcome is computed by applying each engine's documented cache key model. Eviction is triggered by hand to separate its effects from those of partitioning.