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+====== @font-face Load Events ======
+There appear to be several good use-cases for wanting to know when a particular @font-face has been loaded, such as delaying any text operations in <canvas> that want to use the font until after.  Here's a proposal for such.
+===== IDL =====
+  [Constructor(DOMString type, optional FontFaceEventInit eventInitDict)]
+  interface FontFaceEvent : Event {
+    readonly attribute DOMString? family;
+    readonly attribute DOMString? src;
+    readonly attribute DOMString? usedSrc;
+    readonly attribute DOMString? style;
+    readonly attribute DOMString? weight;
+    readonly attribute DOMString? stretch;
+    readonly attribute DOMString? unicodeRange;
+    readonly attribute DOMString? variant;
+    readonly attribute DOMString? featureSettings;
+  };
+  dictionary FontFaceEventInit : EventInit {
+    DOMString family;
+    DOMString src;
+    DOMString usedSrc;
+    DOMString style;
+    DOMString weight;
+    DOMString stretch;
+    DOMString unicodeRange;
+    DOMString variant;
+    DOMString featureSettings;
+  }
+===== Attributes =====
+For the attributes "family", "src", "style", "weight", "stretch", "unicodeRange", "variant", and "featureSettings",
+if the corresponding descriptor is present in the associated @font-face rule,
+the attribute's value is the cssText of that descriptor.
+Otherwise, the attribute's value is the value null.
+For the attribute "usedSrc", if one of the sources was successfully loaded and decoded as a valid font,
+the attribute's value is the CSS serialization of that source.
+Otherwise, the attribute's value is the value null.
+===== Behavior =====
+When a @font-face rule successfully finishes loading its src and is ready to be used,
+or has exhausted all of its sources without finding a valid font file,
+fire a FontFaceEvent of type "load" at the document object.
+Bubbles: No.
+Cancelable: No.