On startup, Thunderbird 17.0 shows a warning in the Error Console:
Error in parsing value for 'padding-bottom'. Declaration dropped.
The value in question, being set on the selector 'treechildren::-moz-tree-cell-text', is auto, which is not a valid value for padding-bottom. It must be a <padding-width> value type, which may take one of the following values <length> or <percentage>.
Created attachment 690982 [details] [diff] [review]
Thank you to file this bug. I saw this error also but forgot it then.
I think “initial” is also an invalid value for that property.
"initial" is valid on every property; and also no error in console.
Okay, I believe you, but which CSS standard defines that value? It’s not present in CSS 2 or 3. Is that some Mozilla-custom value? If so, why is it not prefixed?
It's CSS 3 and unprefixed since Gecko 19. See https://developer.mozilla.org/en-US/docs/CSS/initial
Comment on attachment 690982 [details] [diff] [review]
Checks out OK to me. Thanks Richard!