TriangleMarker does not appear in Browser piloting

I am relatively new to PsychoPy. I am creating an experiment where the participants decide between two options using a slider. When I check the triangle slider box in Builder, it shows a triangle in the desktop version. However, if I am testing the experiment in browser, it is set back to a rectangle. How can I fix it so that it appears in as a triangle both in the Desktop and in the Browser Version?

Another related issue that I have is that Browser allows me to move the slider and get a continuous value, but the Desktop version of the same experiment only allows integer rating.

Thank you!