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Task crashing on Internet Explorer and Safari

URL of experiment:

Description of the problem:
We initially piloted the experiment (less optimized version than it is now.) on pavlovia and it crashed for ~70% of participants although it worked on a couple of our own computers on chrome. Our problem was similar to this post here. We reduced the number of routines as suggested above, and then tested it on multiple computers and browsers this time.

The task works well on Chrome, Microsoft Edge, and Firefox browsers. However, it does not load on internet explorer 3 out of the 3 computers we tried. And it did not work on safari 2 out of the 3 computers we tried. In one case, it did not recognize the mouse during dragging and dropping, and in another case, black boxes replaced the text components about half way through the task

Are there any issues inherent within our task that we could fix (or further optimize) to get it working on these browsers or are these browsers generally not supported by pavlovia? Thank you.