Some users experience crash Safari iPhone and Mac OS X bug. The browser either crashes at launch or causes the device to reboot. Apple reports that it is aware about the problem and working on the fix [it already tried to fix the Gatekeeper vulnerability].
There is the site called Crash Safari that makes Safari browser to self-generate test string and reboot / heat up the device that causes crash Safari Mac OSX issue and is the reason why Safari crashes at launch. This is the crash safari code request that makes the problem and the Cupertino-based company assures it is trying to find a working fix to the issue.
It seems that users with Google Chrome browser won’t crash or reboot and only get slowdown or overheated. Still iDevices and Macs get the bug fixed. This website is a gag site, as it looks like. Users who own Apple gadgets are advised to avoid it and prevent iPhone or Mac from crashing / rebooting / overheating [there is another issue you can face: iPhone 6s battery percentage doesn’t change for many users]. It’s not malicious or anything, but users who end up visiting it get the problems and have to recover from the unpleasant state.
If you happen to visit the site and reboot / crash you should be ok once you recover. There should be no issues with your iPhone or Mac afterwards, still you are highly advised to make no jokes and avoid the problem.
Apple is looking into the fix. Maybe the company would come up with some ideas soon. Meanwhile you should scout the sources and URLs before you click on the link.