In facebook, whenever you navigate to a different URL (in some situations), the URL

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Asked: May 22, 20262026-05-22T22:44:42+00:00 2026-05-22T22:44:42+00:00

In facebook, whenever you navigate to a different URL (in some situations), the URL

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In facebook, whenever you navigate to a different URL (in some situations), the URL changes but there is no feeling sensed as going to a different page.

For example: when we view pictures in facebook, and when we move to the next image the URL changes in the address bar

FROM >facebook.com/foo?bar=foobar&xxxx=

TO > >>facebook.com/foo?bar=boobar&xxxx=

and this is not hashed change also
like

FROM >facebook.com/xxxxx#xxx=xxxx

TO > >>facebook.com/xxxxx#xxx=yyyy

How is this possible seamlessly. I mean how is that only a container is modified on URL change. URL change is supposed to navigate to a different page which can contain cached information from previous page and THIS navigation by URL change can be seen obviously by browser’s screen going blank for a moment.

If using an iFrame, how to implement this ?