//matrixオブジェクトを得る
var matrix = new WebKitCSSMatrix(window.getComputedStyle(obj)).webkitTransform);
//matrix.a(b, c, d, e...)のプロパティあり。
//aとdがスケール。
//↓プロパティの意味
/*
⎛a c e⎞
⎜b d f⎟
⎝0 0 1⎠
*/
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