# Elements need to be referenced in lowercase, e.g. document.getElementsByTagName(“p”)
元素名必须小写
# document.body is deprecated, instead reference it by id or use
document.body 属于不推荐，应该使用id或者（如下的格式）
document.getElementsByTagName(“body”).item(0)
# Collections like document.images, document.applets, document.links, document.forms and document.anchors do not exist when serving XHTML as XML, instead use document.getElementsByTagName()
如果伺服为 XHTML（XML）的话，document.images, document.applets, document.links, document.forms 和 document.anchors 将不复存在。
# innerHTML and document.write cannot be used anymore, instead use DOM methods, e.g. document.createElementNS(“http://www.w3.org/1999/xhtml”, “div”)
innerHTML 和 document.write 将不能使用，取而代之以 DOM 方法，如
document.createElementNS(“http://www.w3.org/1999/xhtml”, “div”)
via http://www.bobbyvandersluis.com/articles/goodpractices.php