XHTML: Problems with invalid assignment of style.height in non-IE browsers

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Today, I am in the long page MDI script control (mzmultipage), in IE and other browsers have been tested through no problem, but in Mozilla, Firefox, Netscape test When the problem comes, my multiple pages are in the page to use the IFRAME, these IFrame initial style.height are 0, and in the Load page, the IFRAME will adapt to the load of the page height, I was through the iframe.style.height=300 so that the height of the IFRAME, This processing in the IE series Browser does not have any problems, but in the non-IE browser anyway not work, through tracking, found that the 300 was not assigned to Style.height, the final test out should be given the assigned unit, that is iframe.style.height= " 300px ", so the assignment is valid, no units of the assignment is invalid, depressed me for a while!"

Description of the environment: I'm using the XHTML DTD, which is on the top of the page: <! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "http://www.w3.org/TR/xhtml1/DTD/ Xhtml1-transitional.dtd"", it is because of this xhtml1.dtd is not in IE browser style.height problems.

Another point of knowledge: in the NETSACPE of the IFRAME, if by setting style.display= "None" to hide the IFrame, the script will be dynamically written to the IFRAME HTML "flush out." So the IFRAME in Netscape if there is script to write HTML and need to dynamically hide/display this IFRAME operation, we recommend that you use the style.width= "0px" style.height= "0px"; Such a way to hide!