これは画像サイズの変更ではなく、表示部分のサイズの変更のみです。
UPD：判明しましたが、まあ...
アイデアは、画像をコンテナに入れることです（この場合は、
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
). ( ) (position="relative"). (position="absolute"), top left . overflow hidden, , , . (a:hover) overflow visible .
.
:
: ( top left )
ul#thumbs a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
, .
ul#thumbs a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
ul#thumbs li#image1 a img{
top:-28px;
left:-55px;
}
ul#thumbs li#image2 a img{
top:-18px;
left:-48px;
}
ul#thumbs li#image3 a img{
top:-21px;
left:-30px;
}
.
.
.
overflow
ul#thumbs a:hover{
overflow:visible;
z-index:1000;
border:none;
}
:
p.thumb{
float:left;
margin:.5em 0;
margin-right:10px;
border:1px solid #999;
padding:2px;
}
p.thumb a{
display:block;
float:left;
width:100px;
height:100px;
line-height:100px;
overflow:hidden;
position:relative;
z-index:1;
}
p.thumb a img{
float:left;
position:absolute;
top:-20px;
left:-50px;
}
p.thumb a:hover{
overflow:visible;
z-index:1000;
border:none;
}
p.thumb a:hover img{
border:1px solid #999;
background:#fff;
padding:2px;
}
:
:
:
アイデアの独創性はAlen Grakalicに属します。