以下三个是我一直以来都没弄清楚的，昨天上google上查了一下，总算解了一段心结。
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the <div> tag
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the <div> tagdefinition and usage
the <div> tag defines a division/section in a document.
differences between html and xhtml
the "align" attribute of the div element was deprecated in html 4.01.
the "align" attribute of the div element is not supported in xhtml 1.0 strict dtd.
tips and notes
note: browsers usually place a line break before and after the div element.
tip: use the <div> tag to group block-elements to format them with styles.
examplesourceoutputthis is some text <div style="color:#ff0000;">
<h4>this is a header in a div section</h4>
<p>this is a paragraph in a div section</p>
</div>this is some text this is a header in a div section
this is a paragraph in a div section
optional attributes
dtd indicates in which dtd the attribute is allowed. s=strict, t=transitional, and f=frameset.
attributevaluedescriptiondtdalignleft
right
top
bottomhow to align the text in the div element. deprecated. use styles instead.tfstandard attributesid, class, title, style, dir, lang, xml:lang
for a full description, go to standard attributes.
event attributesonclick, ondblclick, onmousedown, onmouseup, onmouseover, onmousemove, onmouseout, onkeypress, onkeydown, onkeyup
for a full description, go to event attributes.
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