chromium/src/third_party/blink/web_tests/external/wpt/content-security-policy/style-src/resources/style-src-inject-style.js

document.write("<style>#content { margin-left: 2px; }</style>");

var s = document.createElement('style');
s.innerText = "#content { margin-right: 2px; }";
document.getElementsByTagName('body')[0].appendChild(s);