How to get the text of an svg desc element with javascript

right now I have a group of svg elements (circle, rect, path, etc.).The actual document looks something like this.

<desc>Some Text</desc>
<rect id='a0' fill='green' ...>

So when you you strip the a from the id you would get the corresponding desc element. I do this with the following code:

var WW = document.getElementsB开发者_JS百科yTagName('desc')
var ZZ = evt.target.id
ZZ = ZZ.split('a')
ZZ = ZZ[1]
alert(WW[ZZ].firstChild)

But the only thing the is returned in the alert right now is:

[object Text]

Anybody have any ideas or suggestions? Any help would be great.

I'd try

alert(WW[ZZ].firstChild.data);

To answer the main question (How to get the text of an SVG desc element with JavaScript), this would nowadays work fine:

document.querySelector( 'desc' ).textContent