today’s issue is “if the scrollbar is on the left instead of the right (because of a right‐to‐left directionality) and the background of the element changes, safari won’t repaint the part of the element underneath where the scrollbar would have been on the right‐hand side”
a lot of safari’s painting operations assume a left‐to‐right top‐to‐bottom writing mode and simply fail to paint the correct part of the viewport if it isn’t that