If you leave the DOCTYPE out, the browsers automatically switch to "quirks mode," therefore, it is important to include the DOCTYPE declaration on every web page that you build in order for it to be rendered correctly.
If your Web pages render well in FireFox at present you probably will not encounter any major problems in IE 7 other than minor adjustments here and there. However, I think a realistic designer should at least make a meaningful attempt to follow W3C guidelines for it is the correct way forward.
Do it now so that you will ready for the future...re-designs and total overhauls are a time consuming and painful process. A process, which becomes much easier if your initial design incorporated structurally clean and modular (X)HTML with CSS compliance.
If your Web pages render well in FireFox at present you probably will not encounter any major problems in IE 7 other than minor adjustments here and there. However, I think a realistic designer should at least make a meaningful attempt to follow W3C guidelines for it is the correct way forward.
Do it now so that you will ready for the future...re-designs and total overhauls are a time consuming and painful process. A process, which becomes much easier if your initial design incorporated structurally clean and modular (X)HTML with CSS compliance.
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