In the spec it also says "Deprecated in this specification", what does that mean? 

rbyers@, can you say what deprecation means in the context of https://w3c.github.io/touch-events/#extensions-to-the-document-interface?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6e6da892d1137c8d2b4f5cf84caaf440b5785a40

commit 6e6da892d1137c8d2b4f5cf84caaf440b5785a40
Author: lunalu <lunalu@chromium.org>
Date: Wed Mar 22 22:48:19 2017

Make Document.createTouch arguments non-optional

BUG= 701549 

Review-Url: https://codereview.chromium.org/2747333003
Cr-Commit-Position: refs/heads/master@{#458909}

[modify] https://crrev.com/6e6da892d1137c8d2b4f5cf84caaf440b5785a40/third_party/WebKit/LayoutTests/fast/events/touch/document-create-touch-expected.txt
[modify] https://crrev.com/6e6da892d1137c8d2b4f5cf84caaf440b5785a40/third_party/WebKit/LayoutTests/fast/events/touch/document-create-touch.html
[modify] https://crrev.com/6e6da892d1137c8d2b4f5cf84caaf440b5785a40/third_party/WebKit/LayoutTests/fast/events/touch/touch-event-dispatch-no-crash.html
[modify] https://crrev.com/6e6da892d1137c8d2b4f5cf84caaf440b5785a40/third_party/WebKit/Source/core/dom/Document.idl

#4: filed https://github.com/w3c/touch-events/issues/80

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cf65d881af4fe6daaee692153aaf78716e616860

commit cf65d881af4fe6daaee692153aaf78716e616860
Author: lunalu <lunalu@chromium.org>
Date: Tue Mar 28 20:41:15 2017

Remove UseCounter DocumentCreateTouchLessThanSevenArguments

BUG= 701549 

Review-Url: https://codereview.chromium.org/2774903002
Cr-Commit-Position: refs/heads/master@{#460210}

[modify] https://crrev.com/cf65d881af4fe6daaee692153aaf78716e616860/third_party/WebKit/Source/bindings/core/v8/custom/V8DocumentCustom.cpp
[modify] https://crrev.com/cf65d881af4fe6daaee692153aaf78716e616860/third_party/WebKit/Source/core/frame/UseCounter.h