<!DOCTYPE html>
<div style="display: flow-root">
test1
<div style="float: left; width: 100%">
test2
</div>
<div style="float: left">
test3
</div>
test4
</div>
<div style="display: flow-root">
test1
<div style="float: left; width: 50%">
test2
</div>
<div style="float: left">
test3
</div>
test4
</div>
