Row Groups

The next test was to determine whether table groups like TBODY could receive the same treatment. In this case, the answer was a no. With the TR positioned relatively, you could get a background image on the TBODY to display in each TR but it tiled like the default behaviour between TR and TD. In other words, the problem managed to shift up.

Unfortunately, no amount of relative positioning seemed to unlock this mystery. In fact, setting a relative position on the TBODY made the background disappear altogether.

The Future

Thankfully, IE8's rendering engine has been written from scratch and the current beta does not exhibit this behaviour.

Feel free to check out the test page I put together, which demonstrates the alpha PNG over the background set in the table row.

Published September 18, 2008
Categorized as HTML and CSS
Short URL: http://www.livedjmix.com/s/911

Conversation

9 Comments · RSS feed
Steve Killen said on September 18, 2008

I can imagine this causing me headaches at some point in the future, must remember this article for reference thanks Snook.

Btw is that a sneaky preview of the next design of this site?!

Matt Puchlerz said on September 18, 2008

Just a word of warning!

Checking out the demo page in Safari (3.1.2), the background on the <tr> repeats per cell just like in IE. I wasn't expecting to see that.

Jonathan Snook said on September 18, 2008

@Steve Killen: Sort of. ;) It was from a jpg I had exported from my first revision of the new design. But the final version looks absolutely nothing like that.

@Matt Puchlerz: Oh man, I didn't expect that either. And nothing I throw at it really seems to make a difference. That's it, I give up on this internet stuff.

Matt Puchlerz said on September 18, 2008

I messed around with it for a bit as well, but to no avail.

Funny enough... doing a quick search yields a page discussing a similar problem to this one. Look familiar?

Pies said on September 18, 2008

Unsurprisingly, your example yields the same result in Chrome as it does in Safari.

Pies said on September 18, 2008

The CSS 2.1 specs say that the row's background "covers exactly the full area of all cells that originate in the row, even if they span outside the row, but this difference in area does not affect background image positioning" (http://www.w3.org/TR/CSS21/tables.html#table-layers).

I'd think that makes Firefox implementation perfect, but doesn't exactly make Safari/Chrome implementation wrong (unless I'm misreading the specs).

Jonathan Snook said on September 18, 2008

I've always believed that diagram to be the way things should render and the way it's described, Firefox gets it wrong as well. The graphic should extend the full width of the table as if it was an element surrounding all cells (since it is). Alas, with IE8 following in Firefox's (and Opera's) footsteps, I doubt we'll see that change.

The table spec has been one of the most inconsistent across all browsers and it has taken years to see it come even close to being similar. (Making HTML5's 2022 target a pretty realistic assessment based on what current browsers have accomplished.)

Jamie Hill said on September 18, 2008

The spec is a little un-clear if you ask me. I'm getting the same Safari issue but which is right Safari/Chrome (or Webkit in general) and IE or Firefox. I'm thinking that Mozilla just saw the spec differently, this could do with clarification.

Annamalai said on October 20, 2008

Ya It is wonder fyl

Sorry, comments are closed for this post. If you have any further questions or comments, feel free to send them to me directly.
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