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<!DOCTYPE html>
<meta charset="UTF-8">
<style>
#span-doc {
color: green;
background-color: greenyellow;
}
</style>
<body>
<iframe
id="iframe"
srcdoc="
<style>
span {
color: blue;
background-color: cyan;
}
</style>
<span id='span-iframe'>abc</span>
"
>
</iframe>
<br>
<span id="span-doc">abc</span>