>Len,
>
>I confirmed your findings both for Opera 5.12 and for IE 6.0. Ain't it crazy?
>
>Hilmar.

What I think is happening is that for external style sheets, the file must only contain CSS. The STYLE tag is HTML, but is being interpreted as CSS. The browser is trying to interpret the STYLE tag as an element that the style information in the following { } pair applies to.

What I've found is that it isn't H1 that is being ignored, it is the first element, so if you rearrange your CSS file so that H1 isn't first, then you'll find that the new first element is ignored.

The browser only gets back into synch. after the first }. ie. what it thinks is the end of the first CSS definition. (If you replace H0 {} with just } everything is OK).

So I think that your textbook needs treating with a little care, if it makes the mistake of telling you that the STYLE tag is required in the external CSS file.