Inject the CSS into the DOM. This is preferable over using a regular CSS
file since:
a) It loads synchronously and doesn't force a redraw later.
b) It speeds up loading by not blocking on a separate HTTP transfer.
c) The CSS content may be made dynamic depending on init options.
Parameters
hasCss: boolean
If false, don't inject CSS
(providing CSS becomes the document's responsibility).
Inject the CSS into the DOM. This is preferable over using a regular CSS file since: a) It loads synchronously and doesn't force a redraw later. b) It speeds up loading by not blocking on a separate HTTP transfer. c) The CSS content may be made dynamic depending on init options.