However I ran in to some very serious issues with the tag combined with the
legend element, so serious, in it's current state, it's unusable.
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This article has been cross posted from HTML 5 Doctor.
Overview of the details element
details element, by default, is a collapsed element whose summary, or label, is the first child
legend (if no
legend is used, the UA provides a default, such as "Details"), with a triangular button to indicate it's current open state.
If you include the
open attribute, then the element is open by default. In theory, you could attach a click event to the legend, and switch the
The markup would roughly be this:
<details open="open"> <legend>Terms & Conditions</legend> <p>You agree to xyz, etc.</p> </details>
Here's the details test page I was working from: HTML 5 details test
The biggest problem, and the show stopper for me, is that the browser's treatment of the
legend element completely breaks this markup pattern - this is true for all the major browsers: Opera, Safari, Firefox and IE (tested in all the latest and some older browsers). I'll go in these issues in detail in a moment.
Other problems include:
- Styling the legend element is exceptionally difficult, particularly positioning
- Using the WHATWG guidelines to styling the
detailselement prove both difficult to interpret and difficult to implement.
- When using CSS to style the open state of the
Surprisingly Firefox is the worst one out in these issues, the rest of the browsers have fairly same treatment of the issue. In the screenshots, I've included a
fieldset and nested
legend for reference.
Both IE7 & IE8 closes the
legend element it encounters when it's not inside a
fieldset element and move it's contents out to an adjacent text node.
What's also strange, is that looking at the DOM it also creates another empty(?) closed
legend element after that text node. It doesn't have any effect, but just looked odd:
Opera (9 & 10b) is very similar to IE in it's treatment of the
legend in the details element, except it doesn't create the second closing
legend node. It just closes the
legend, and creates the adjacent text node.
Safari simply strips the
legend all together out of the DOM. So much so, that if you open the web inspector, then the error console, you'll see it warning out that it's encountered an illegal element, ignoring it, then encountering the closing tag, so it ignores that too. You're left with just the text node.
The best for last. Firefox goes one step beyond the other browsers. It assumes you've forgotten to include the
fieldset element. So when it hits the
legend element, Firefox inserts an opening
fieldset up until it finds (I believe) the closing
fieldset element, which obviously it doesn't so the result is the rest of the DOM, after the first illegally placed
legend ends up eaten by
fieldset element, which leaves my DOM in a mess:
Impact on other elements
details isn't the only element that reuses the
legend element for labelling, the
figure element also is supposed to support the
legend element. The result is obviously going to be the same.
We can't style the legend element when the text is being thrown out by all the browsers, and Firefox's DOM mangling is just too painful to look at.
This basically means that we can't, in any reasonable amount of time, use the
legend element inside both the
figure element in the spec's current state.
For me, I'll be using an alternative element, probably just a
p element styled to look like a
legend, but that's really not the point. Ideas anyone?
It turns out we weren't the only ones looking at this and Ian Hickson has responded on the issue:
My plan here is to continue to wait for a while longer to see if the parsing issues can get ironed out (the HTML5 parser in Gecko for instance solves this problem for Firefox). If we really can't get past this, we'll have to introduce a new element, but I'm trying to avoid going there.
It's fine to think that Gecko will update, but it's IE that I'm worried about, they won't turn out their render engine, and the result is we'll have to avoid using the
legend in any element other than