lib/jsdom/living/helpers/stylesheets.js
function addStylesheet(sheet, elementImpl) {
  elementImpl._ownerDocument.styleSheets.push(sheet);

  // Set the association explicitly; in the spec it's implicit.
  elementImpl.sheet = sheet;

  // TODO: title and disabled stuff
}
function addStylesheet(sheet, elementImpl) {
  elementImpl._ownerDocument.styleSheets.push(sheet);

  // Set the association explicitly; in the spec it's implicit.
  elementImpl.sheet = sheet;

  // TODO: title and disabled stuff
}
function addStylesheet ( sheet , elementImpl ) { elementImpl . _ownerDocument . styleSheets . push ( sheet ) ; // Set the association explicitly; in the spec it's implicit. elementImpl . sheet = sheet ; // TODO: title and disabled stuff }
https://drafts.csswg.org/cssom/#add-a-css-style-sheet
https : // drafts . csswg . org / cssom / #add - a - css - style - sheet