private HeadElement getHead() {
if (head == null) {
Element elt = Document.get().getElementsByTagName("head").getItem(0);
assert elt != null
: "The host HTML page does not have a <head> element"
+ " which is required by StyleInjector";
head = HeadElement.as(elt);
}
return head;
}
public StyleElement injectStyleSheetAtStart(String contents) {
StyleElement style = createElement(contents);
getHead().insertBefore(style, head.getFirstChild());
return style;
}