古いブラウザが大半だろうから、サポートしませんって言っても良いのかもしれないけどさ
jQuery使っておいたほうが安全だろ？

// Support: real iOS 8.2 only (not reproducible in simulator)
// `in` check used to prevent JIT error (gh-2145)
// hasOwn isn't used here due to false negatives
// regarding Nodelist length in IE

// Support: Firefox<24
// Workaround erroneous numeric interpretation of +"0x"

// Support: Chrome 14-35+
// Always assume duplicates if they aren't passed to the comparison function

// Support: Webkit<537.32 - Safari 6.0.3/Chrome 25 (fixed in Chrome 27)
// Detached nodes confoundingly follow *each other*

// Support: IE 9 - 11 only, iOS 7 only, Android Browser <=4.3 only
// Treat the template element as a regular one in browsers that
// don't support it.

// Support: Chrome <=35 - 45
// Webkit & Blink performance suffers when deleting properties
// from DOM nodes, so set to undefined instead
// https://bugs.chromium.org/p/chromium/issues/detail?id=378607 (bug restricted)

// Support: Firefox <=43 - 45
// Disconnected elements can have computed display: none, so first confirm that elem is
// in the document.

// Support: Windows Web Apps (WWA)
// `name` and `type` must use .setAttribute for WWA (#14901)