{# A BLOCK SET TO A SHARE OF ITS CELL (#357). The share is a percentage on both spellings: the attribute, which Outlook's Word engine reads, and the style, which a browser and the print engine read (a print engine does not map a table's width attribute). It is placed by the section's alignment: the outer cell's `align` attribute for Outlook (with its style twin, #125, the section's own value, so nothing new is inherited), the inner table's auto margins for everyone else. `align` on the inner table itself would float it, and copy after it would wrap. Context: content — the block, rendered at the share's width; share — its percentage of the cell; place — the section's alignment, empty for left. #}