Third party cookies blocking is illegal, because its against disability laws. After blocking third party cookies disable people can not surf internet in multiple ways. Like functions of webaccessibilitytool.com stopped by this block.
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Multiple countries have multiple laws for Accessibility. You can see atoall.com for more information. ADA law in America is very important. Safari blocks third party cookies by default. It is illegal.
WebKit bugzilla is not an appropriate venue to discuss Safari policy choices, so resolving as invalid.