<!DOCTYPE HTML> <html> <body> <div><span></span> Hello</div> <div><span style="border:1px solid transparent"></span> Hello</div> <div><span style="outline:1px transparent"></span> Hello</div> <div><span style="padding:1px"></span> Hello</div> <div><span style="margin:1px"></span> Hello</div> <div><span> </span> Hello</div> <div><span style="border:1px solid transparent"> </span> Hello</div> <div><span style="outline:1px transparent"> </span> Hello</div> <div><span style="padding:1px"> </span> Hello</div> <div><span style="margin:1px"> </span> Hello</div> </body> </html>