Nasty piece of CSS code crashes and restarts iPhones Vulnerability most likely affects any iOS and macOS app that uses the WebKit rendering engine to display web pages. Apple is investigating.

To show off what EdgeHTML can do, Microsoft has built a browser using predominantly JavaScript, HTML, and CSS. Next, the company released the app on the Windows Store and the sample code on GitHub.

By appending just a few lines of HTML and CSS code, researcher Louis Dion-Marcil showed how an external sender could hide the very warning from an email message.