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With this fiddle http://jsfiddle.net/mungbeans/f2ne6/2/
why is the opacity undefined when accessed in js when its defined in the css?
I presume the answer is because the style is also undefined, why is that, does the style need adding somewhere explicitly before the opacity can be defined?
EDIT
the lack of [] is a typo created as I copied from source to fiddle. The style/opacity problem still exits in the original code which is correct in that aspect.
title.style.opacityshould be:
title[0].style.opacitysince getElementsByTagName returns a nodeList.
EDIT:
This still doesn’t get the value. You’ll need to do the following:
window.getComputedStyle(title[0]).opacityhttps://developer.mozilla.org/en-US/docs/DOM/window.getComputedStyle?redirectlocale=en-US&redirectslug=DOM%3Awindow.getComputedStyle
DEMO: http://jsfiddle.net/f2ne6/12/