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[20 名無しさん＠お腹いっぱい。 2017/01/15(日) 15:20:51.03 ID:MBBAKzoo0]

a:hover {
position: relative;
}
a:hover:after {
position: absolute;
content: attr(href);
top: 50px;
left: 50px;
font-family: arial;
font-size: 9px;
line-height: 1;
color:black;
background-color: rgba(252, 252, 62, 0.9);
border: black solid 1px;
}