There is one difference to note here: because an image button is a click-able form element, you should always provide alternate text for it.
这里有一个要注意的不同点：因为图像按钮是可单击的表单元素，所以您应该总是为它提供替代文本。
2
Yes, you can use a variable for the name of the form, but what if an alternate presentation doesn't actually use a form?
虽然可以对表单的名称使用一个变量，如果碰到不使用表单的呈现，应该怎么办呢？
3
Some people, however, never develop severe mania but instead experience milder episodes of hypomania that alternate with depression; this form of the illness is called bipolar II disorder.