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[cssom-view] Add 'onmove' event handler for the Window object #9664

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[cssom-view] Add 'onmove' event handler for the Window object #9664

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33 changes: 32 additions & 1 deletion cssom-view-1/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -732,7 +732,6 @@ The <dfn attribute for=Window caniuse=devicepixelratio>devicePixelRatio</dfn> at
1. Let <var>device pixel size</var> be the vertical size of a device pixel of the output device.
1. Return the result of dividing <var>CSS pixel size</var> by <var>device pixel size</var>.


<h3 id=the-features-argument-to-the-open()-method>The <var ignore>features</var> argument to the {{Window/open()}} method</h3>

HTML defines the {{Window/open()}} method. This section defines behavior for position and size given
Expand Down Expand Up @@ -1004,6 +1003,16 @@ compatibility reasons.

Note: Some non-conforming implementations are known to return 32 instead of 24.

<h2 id=extensions-to-the-windoweventhandlers-interface>Extensions to the {{WindowEventHandlers}} Interface</h3>

<pre class=idl>
partial interface WindowEventHandlers {
attribute EventHandler onmove;
};
</pre>

<dfn attribute for=Window>onmove</dfn> is the <a>event handler IDL attribute</a> for the <a event>move</a> event.


<h2 id=extensions-to-the-document-interface>Extensions to the {{Document}} Interface</h2>

Expand Down Expand Up @@ -1933,6 +1942,22 @@ Issue: In what order are scrollend events dispatched? Ordered based on scroll st
1. Otherwise, <a>fire an event</a> named <a event>scrollend</a> at <var>target</var>.
1. Empty <var>doc</var>'s <a>pending scrollend event targets</a>.

<h3 id=moving-viewports>Moving viewports</h3>

This section integrates with the <a for=/>event loop</a> defined in HTML. [[!HTML]]

When <a for=/>updating the rendering</a>, after running the scroll steps:

1. For each fully active Document in docs, <dfn export for=Document>run the move steps</dfn> for that Document.

When asked to <a>run the move steps</a> for a {{Document}} <var>doc</var>, run these steps:

1. If <var>doc</var>'s client window has had its position relative to the <a>Web-exposed screen area</a> changed
(e.g. as a result of the user moving the browser window)
since the last time these steps were run,
<a>fire an event</a> named <a event>move</a>
at the {{Window}} object associated with <var>doc</var>.

<h3 id=event-summary>Event summary</h3>

<i>This section is non-normative.</i>
Expand Down Expand Up @@ -1963,6 +1988,12 @@ Issue: In what order are scrollend events dispatched? Ordered based on scroll st
<td>Fired at the {{VisualViewport}}, {{Document}}, or element when a scroll is <a lt="scroll completed">completed</a>: the
{{VisualViewport}}, <a>viewport</a>, or element has been scrolled, the scroll sequence has ended and any scroll offset changes have
been applied.
<tr>
<td><dfn event for="Window">move</dfn>
<td>{{Event}}
<td>{{Window}}
<td>Fired at the {{Window}} when the client window is moved relative to the <a>Web-exposed screen area</a>.
<tr>
</table>


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