Keydown Event
<rect width="100%" height="100%" fill="blue"
onkeydown="press(evt)"/>
<text id="text" x="25" y="27" text-anchor="middle">0</text>
Keyup Event
<rect width="100%" height="100%" fill="blue"
onkeyup="press(evt)"/>
<text id="text" x="25" y="27" text-anchor="middle">0</text>
Keypress Event
<rect width="100%" height="100%" fill="blue"
onkeypress="press(evt)"/>
<text id="text" x="25" y="27" text-anchor="middle">0</text>