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Test Info:

<!DOCTYPE html>
<title>CSS Anchor Positioning: Crash with anchor functions flex-basis</title>
<style>
#dut1 {
display: flex;
}
#dut2 {
flex-basis: anchor-size(--a width, 10px);
}
#dut3 {
flex-basis: auto;
width: anchor-size(--a width, 10px);
}
</style>
<div id=dut1>
<div id=dut2></div>
<div id=dut3></div>
</div>