Re: [w3c/uievents] Initial 'source' defn (PR #405)

@flackr commented on this pull request.



> @@ -163,6 +163,21 @@
      The <a>un-initialized value</a> of this attribute MUST be
      <code>0</code>.
     </dd>
+
+    <dt><dfn attribute>source</dfn></dt>
+    <dd>
+     The <code>source</code> attribute is a ready only attribute which

s/ready/read

> @@ -163,6 +163,21 @@
      The <a>un-initialized value</a> of this attribute MUST be
      <code>0</code>.
     </dd>
+
+    <dt><dfn attribute>source</dfn></dt>

I think this attribute needs to be added to the WheelEvent interface above

> @@ -163,6 +163,21 @@
      The <a>un-initialized value</a> of this attribute MUST be
      <code>0</code>.
     </dd>
+
+    <dt><dfn attribute>source</dfn></dt>
+    <dd>
+     The <code>source</code> attribute is a ready only attribute which
+     indicates the reason this event has been generated and takes one of
+     three possible values:

What value would we expect if you create a WheelEvent? I think this is intended to be specified as the "un-initialized" value.

> @@ -163,6 +163,21 @@
      The <a>un-initialized value</a> of this attribute MUST be
      <code>0</code>.
     </dd>
+
+    <dt><dfn attribute>source</dfn></dt>
+    <dd>
+     The <code>source</code> attribute is a ready only attribute which
+     indicates the reason this event has been generated and takes one of
+     three possible values:
+
+       * 'user': this event has been generated as a result of direct user
+         action.
+       * 'momentum': this event has been generated as a result of momentum
+         scrolling which is an animation that is done after the user stops
+         directly interacting with the input device.
+       * 'unknown': the browser could not determine the reason this event
+         has been generated

Outside of programmatically generated events, do we know if there are any platforms where we won't be able to determine this? I wonder if we need an unknown value at all.

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