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<!DOCTYPE html>
<style>
#iframe_box {
width: 100px;
height: 100px;
background-color: green;
}
</style>
<div id='iframe_box'></div>
<!DOCTYPE html>
<style>
#iframe_box {
width: 100px;
height: 100px;
background-color: green;
}
</style>
<div id='iframe_box'></div>