#import <DOM/Document.idl>
#import <DOM/Element.idl>
#import <DOM/Node.idl>

callback IntersectionObserverCallback = undefined (sequence<IntersectionObserverEntry> entries, IntersectionObserver observer);

[Exposed=(Window)]
interface IntersectionObserver {
    constructor(IntersectionObserverCallback callback, optional IntersectionObserverInit options = {});

    undefined observe(Element target);
    undefined unobserve(Element target);
    undefined disconnect();

    // FIXME:
    // sequence<IntersectionObserverEntry> takeRecords();
};

dictionary IntersectionObserverInit {
    (Element or Document)? root = null;
    DOMString rootMargin = "0px";
    (double or sequence<double>) threshold = 0;
};