Blink in Google Chrome prior to 54.0.2840.59 for Windows, Mac, and Linux; 54.0.2840.85 for Android permitted execution of v8 microtasks while the DOM was in an inconsistent state, which allowed a remote attacker to inject arbitrary scripts or HTML (UXSS) via crafted HTML pages.
https://security.gentoo.org/glsa/201610-09
https://codereview.chromium.org/2330843002
https://chromereleases.googleblog.com/2016/10/stable-channel-update-for-desktop.html