Last minor update: 24 May 2004
Last major update: 8 October 2003.
Tested version: 7.50
With the release of Opera 7, Opera Software has made a great leap forward. Work on the code engine that powers Opera 7 began more than a year ago. Its purpose was to allow for a reflowing of the page, which in turn allows for advanced DHTML effects and real use of the W3C DOM.
When a browser loads a page it determines how it will be shown to the user. Modern browsers
allow this initial layout to be changed later on, while older browsers don't. Opera 6 and below
could not change this initial layout, could not reflow a page. Opera 7 can.
Similarly, Netscape 4 could not change the initial layout while Netscape 6 can. Explorer has always been quite advanced in this respect.
So Opera 7 fully supports the W3C DOM, and as a result it can completely change the page
without reloading it. The only thing it cannot (yet) do is
importing an XML file.
I haven't yet found any bugs in its W3C DOM implementation, though no doubt something nasty will lie hidden somewhere. But for the moment it's very good indeed.
Some old problems have disappeared. Opera 7 supports clipping, which means that my Scrolling layer script works. Since a page can be reflowed, Opera 7 also supports the changing of the display declaration, which means my display navigation used in the frame on the left finally works.
Since Version 6 Opera has been busy moving towards Explorer's way of interpreting CSS in Quirks mode (but not, as far as I know, in Strict mode).
For instance, in Quirks mode it now uses the
as default box sizing, as Explorer does, and it supports
in the same way: the box sizes with the content (see the Overflow
It seems to follow Explorer's doctype implementation, including the use the XML declaration. If you put this on the first line of your page
<?xml version="1.0" encoding="iso-8859-1"?>
Opera switches back to Quirks mode, as does Explorer 6.
document.all DOM, but otherwise
it doesn't seem to move particularly towards Explorer's implementation.
Of course there are still some bugs:
location.hash. First jump to the bugs list, then try it here. This is the more annoying since the
location.hrefstill doesn't show the hash, either. (Try it here). Besides, when you reload a page the hash mysteriously disappears from the URL shown in the location bar.
unloadevents do not fire when you use the Back and Forward buttons. Try it in my frameset: go to another page, then come back here by pressing the Back button. The navigation frame does not register this change in pages because it isn't told to.
scripttag in pages served with the
application/xml+xhtmlmime type. Solution: don't use this mime type. It's unnecessary anyway.
position: fixedin the navigation frame. It is shown correctly only after you've opened two navigation divs.
<script>block in the
<link>tags to the style sheets, Opera 7.20 ignores the style sheets. Putting the
<script>block after the
<link>tags solves this bug.
Opera 7.50 for Mac has appeared at roughly the same time as the Windows version. For the first time, Opera has the two main OSses in sync; the Mac version used to be four to six months behind the Windows version.
I haven't yet discovered any differences between the Windows and Mac versions, but that doesn't mean they're not there.