在 col 元素中声明事件对表的单元格有何影响？

当在 HTML 表格的 col 元素中声明事件（例如 onclick）时，该事件是否会影响 col 元素引用的单元格？该事件是否被忽略？还会发生其他事情吗？

很好的问题。

The spec http://www.w3.org/TR/html4/struct/tables.html#edef-COL says:

<!ATTLIST COL                          -- column groups and properties --
  %attrs;                              -- %coreattrs, %i18n, %events ---

where %events says http://www.w3.org/TR/html4/sgml/dtd.html#events:

<!ENTITY % events
 "onclick     %Script;       #IMPLIED  -- a pointer button was clicked --
  ondblclick  %Script;       #IMPLIED  -- a pointer button was double clicked--
  onmousedown %Script;       #IMPLIED  -- a pointer button was pressed down --
  onmouseup   %Script;       #IMPLIED  -- a pointer button was released --
  onmouseover %Script;       #IMPLIED  -- a pointer was moved onto --
  onmousemove %Script;       #IMPLIED  -- a pointer was moved within --
  onmouseout  %Script;       #IMPLIED  -- a pointer was moved away --
  onkeypress  %Script;       #IMPLIED  -- a key was pressed and released --
  onkeydown   %Script;       #IMPLIED  -- a key was pressed down --
  onkeyup     %Script;       #IMPLIED  -- a key was released --"
  >

所以是的，看来事件是supposed得到支持tds.

然而，“应该”与“确实”相差甚远。唯一知道的方法是在所有浏览器中进行测试，并希望它也适用于未来的浏览器。

再想一想，只需使用事件委托 http://www.sitepoint.com/blogs/2008/07/23/javascript-event-delegation-is-easier-than-you-think/并绑定一次到父级table反而。这将在现在和永远更有效。