This is based on Angular 1's implementation, parsing an HTML document
into an inert DOM Document implementation, and then serializing only
specifically whitelisted elements.
It currently does not support SVG sanitization, all SVG elements are
rejected.
If available, the sanitizer uses the `<template>` HTML element as an
inert container.
Sanitization works client and server-side.
Reviewers: rjamet, tbosch , molnarg , koto
Differential Revision: https://reviews.angular.io/D108
f86edae9f3