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<!DOCTYPE html>
<script>
var mouseButton = -1;
var menuType = "none";
function mouseDownHandler(event)
{
mouseButton = event.button;
event.preventDefault();
}
function pressedMouseButton()
{
return mouseButton;
}
function contextMenuHandler(event)
{
menuType = "context";
event.preventDefault();
}
function displayedMenu()
{
return menuType;
}
addEventListener("mousedown", mouseDownHandler);
addEventListener("contextmenu", contextMenuHandler);
</script>
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