Links that cause iPhone and iPads to crash or reboot have become a bit of a trend in recent years. The last was published by security researcher @pwnsdx over Twitter. What's interesting about this particular, it relies on a simple excerpt of HTML and CSS, and causes a complete kernel, beyond just a single springboard crash.
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The error affects Any iOS device that can interpret the background filter effect, which was first introduced in iOS 7. Basically, the few lines in CSS use a blurred blur for each div element on the page. The included HTML contains many div elements.
The computationally expensive drawing overloads the WebKit renderer and the system can not recover other than kernel panic, crash to the Apple logo, and start over.
You can see the source code for the error here; There are only a few lines of HTML and CSS. You can open the link "safari-ripper.html" on that page if you want to try it yourself – but the usual disclaimers and warnings apply. 9to5Mac has confirmed that it works on iOS 11 and iOS 12, so you do not need to.
– Sabri (@pwnsdx) September 15, 2018
Unlike similar text messaging issues that may spread like chain mail over iMessage notifications, this requires that the user should visit a webpage containing the problematic code. At worst, this code may be embedded in an HTML email that causes the device to crash when the message opens.