Chrome won’t allow IFRAME to load a html file via http while main page using https

i just found a weird thing that the Chrome browser don’t allow an iframe to load a http url when the current url in the addr bar begin with https.for eample,if the current page’s url is:

and it contains an iframe whose src is

then,it worked ok in Firefox browser but  the iframe break in Chrome.
after google for a while,i get some conclusion when calling a page from other domain with diff protocol,:

page – iframe – status
http – http  – allowed
http – https – allowed
https- http  – not allowed
https- https – not allowed

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