void draw(){
 background(0);
 translate(50, 15);
 for(int i=0; i<=75; i++){
   stroke(255, 255-255*((frameCount+i)%240)/240);
   point(0, i);
 }
}

This applet does not run normally under Win+IE, but runs normally under OSX+Safari.

under Win+IE
http://www.geocities.jp/re_chestnut/test/a.gif

under OSX+Safari
http://www.geocities.jp/re_chestnut/test/b.gif

I apologize for the thing that those links don't work.

This code is a program that draws the line while smoothly changing brightness.
When this code is run with the Run button, it works normally.
However, brightness doesn't change smoothly when this exported applet on the web is run under Windows+IE.

Because the applet of RBGCube included in Learning is displayed full-color, I think  monitor settings to be unquestionable.

It is displayed like the movement of the point rather than the brightness of the line not smoothly changing.
When also executing it with the Run button after "Setup() {size(100,100);}" was added to the above-mentioned code, a similar phenomenon was able to be reproduced.
Moreover, there is no problem when a comparatively large size of the display such as "Setup() {size(200,200);}" is specified when executing it with the Run button.