htm 跟 html 的分別

以HTML語言建成的文件,其副檔名可以是*.htm或*.html
用*.htm或*.html事實上是 完全 沒有分別的!!

如已經完成的網頁可以轉 html 嗎? 對網頁有沒有影響?
如果是單一頁面的話,一般都沒有任何影響

但若果是數個網頁的話,就要注意當中的超連結網址都要作出相應修改
否則可能會連不到已改名的網頁

圖片參考：http://hk.yimg.com/i/icon/16/6.gif
You asked:
1
Are HTM and HTML have difference?
Both HTM and HTML are HTML document (Microsoft FrontPage document), so they do not have difference. The HTML codes in them also have no difference.
HTM began to appear in computers earlier than HTML. And the styles of them are same. HTML is just let us to have one more choosing.
Now most people use HTM for the HTML documents, because the Microsoft FrontPage uses HTM as default document, the people do not change it so the pages in web are *.HTML is less than *.HTM.
2
If I created a HTML document, can I change it from *.HTM into *.HTML?
Of couse you can do it. But you need to change the URLs in other pages after changing the subtitle name.
If you done a page, as you save it, just type [the file name.HTML] (Because the default name is *.HTM).
As you upload in Yahoo! Geocities, you find that a check box which is [Change*.htm into *.html], you can tick it and it will automatically change the HTM files into HTML files.
3
If it change into *.HTML, will it bring some infections?
No. The format are same so it will not infect the file.

http://www.notmp3.com/csstemp/in/
有些css版型下載

2者的用法係無分別的
我依稀記得我學時,
係話htm係從前比較多用,
html係後期才common的,
所以我唸html係比較後期才展出的版本

製造網頁時，用htm和html沒有太大分別，只是副檔名不同了。
如你用軟件寫網的話，可能會規定副檔名，可能可以讓你選。

如frontpage會默認為html，你可以這樣改副檔名:
在檔名後加上 .htm (如果要改為html都是用這method)

這樣對網頁是沒有影響的，你可大大放心。