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<!DOCTYPE html>
<style>
.test {
width: 200px;
height: 200px;
box-sizing: border-box;
margin: 50px auto;
outline: 1px solid black;
border: 10px solid transparent;
background: linear-gradient(green, green);
/* Same border-shape as the test, but with border-radius: 0.
If they match, then border-radius on the test was successfully ignored. */
border-shape: inset(0px) inset(10px round 20px);
border-radius: 0px;
}
</style>
<div class="test"></div>