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// Helper function to assert that the correct scroll-marker among those in the
// provided list is selected.
function verifySelectedMarker(selected_idx, items, selected_color,
unselected_color) {
for (let idx = items.length - 1; idx >= 0; --idx) {
const should_be_selected = idx == selected_idx;
let expected_color = should_be_selected ? selected_color : unselected_color;
const color =
getComputedStyle(items[idx], "::scroll-marker").backgroundColor;
assert_equals(color, expected_color,
`marker ${idx} should be ${should_be_selected ? "" : "un"}selected.`);
}
}