Pinned badges and date gutters line up on real sites

A foundational positioning fix, found by rendering real sites. When a page pins something to the edge of a padded box - a date to the left of a headline, a status dot in a card corner, an underline under a link - the engine measured from inside the padding instead of the box's true edge, so the pinned element landed shifted inward, sometimes right on top of the text. a programming-language site shows its news and event dates this way, and they were sitting on top of the titles; now they sit in their gutter, as in every other browser. This run also brings the parity scorecard to 60, earned by rendering about fifteen major sites and fixing what the pictures showed.