When dragging over the saturation/brightness box or hue selector the mouse starts selecting text. This isn't immediately noticeable, but if you drag your mouse outside of the draggable area you end up highlighting text all over the page.
The text selection should be disabled between mousedown and mouseup.
Just noticed that this is happening on the up/down dragging arrows near the HSB/RGB inputs. As you drag off the target element (arrows) almost immediately, this highlighting is very obvious.
When dragging over the saturation/brightness box or hue selector the mouse starts selecting text. This isn't immediately noticeable, but if you drag your mouse outside of the draggable area you end up highlighting text all over the page.
The text selection should be disabled between mousedown and mouseup.