"></script>
<script src="/css/support/computed-testcommon.js"></script>

<div id="target"></div>

<script>
test_computed_value("border-block-end-radius", "10px");
test_computed_value("border-block-end-radius", "10px 10px", "10px");
test_computed_value("border-block-end-radius", "5px 10px");
test_computed_value("border-block-end-radius", "10px / 5px 10px");
test_computed_value("border-block-end-radius", "5px 10px / 10px");
test_computed_value("border-block-end-radius", "10px 10px / 5px 5px", "10px / 5px");
<