<em>onmousedown</em>, <em>onmouseup</em> & <em>onclick</em> are all triggered by the browser. However, the <em>onmousedown</em> event doesn't trigger until you lift the stylus or you've held it on the screen for ~2 seconds—which is when text selection mode is activated—making it pretty much the same as <em>onmouseup</em>. The events cannot have their default action cancelled.
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The <em>mousedown</em>, <em>mouseup</em>, and <em>click</em> events are all triggered by the browser. However, the <em>mousedown</em> event doesn't trigger until you lift the stylus or you've held it on the screen long enough to trigger text selection mode. Text selection mode requires pressing the touchscreen for approximately 1.05 seconds in the Old3DS browser, or pressing the touchscreen for approximately 0.41 seconds in the New3DS browser. Also, the <em>mousedown</em> event is only dispatched while text selection mode is active. The events cannot have their default action cancelled.
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The <em>onmousemove</em> and common touch/gesture events are not supported.