MS Edge: Expand/contract buttons do not work if clicked in icon

On MS Edge only:

Clicking on one of the plus or minus icons on the expand/contract button on the API explorer does not cause the panel to toggle. The toggle function runs from an onclick on the span element, not on the button element.

Adding the CSS pointer-events: none to the span elements resolves the issue on Chrome (where it was previously present), but not on Edge.