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<h3 id="incompatible">Incompatible or Behavior-altering Changes in @version-minor@</h3>
<ul>
+ <li>Window close shortcuts have been changed, and ESCAPE is no longer a hard-coded default, but rather a soft one,
+ and can be removed. If the <pre>close-shortcut</pre> attribute of the <pre>v-window</pre> element is present,
+ it must list all close shortcuts, including ESCAPE, separated by whitespace. Existing, unchanged code should
+ behave as before. See ticket <a href="https://dev.vaadin.com/ticket/17383">#17383</a> for more information
+ on the reasoning behind the change.</li>
<li>The push path has been changed from /PUSH/ to /PUSH to be compatible with JSR 356.</li>
<li>Widgetset files and other pre-compressed resources are sent as gzip to compatible browsers.
This may interfere with custom response compression solutions that do not respect the Content-Encoding response header.</li>