[Jellby]

Somehow ADE (at least 1.7, which is what I can try), is discarding the bottom margin of p.text if you assign "height: 0" (or "line-height: 0") to .hidhead, even without the visibility/display tricks. I've seen ADE doing similar things before, so I'd suggest "height: 0.0001px", or, to be safe:

.hidhead {
        visibility: hidden;
        margin: 0;
        padding: 0;
        /* work around ADE's dislike for "0" */
        height: 0.0001;
        overflow: hidden;
}