标签：doctype http name www. class nbsp hold style org
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
改成
<!DOCTYPE html>
Undefined attribute name (placeholder)
标签：doctype http name www. class nbsp hold style org
原文地址：https://www.cnblogs.com/tk55/p/8988690.html
