How do you insert tables on webpages?

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Repelling text under a placeholder seems a bit difficult, if you don't know the specific size required by its content. As an example, I used the same spreadsheet generated table from my post above.

• I created sample text on MouseOff layer.
• I added a Placeholder-rectangle, then added the HTML for the table (output by Excel).
• Viewing the page, I realize that I need to do a 'Repel text under' for the Placeholder-rectangle. Doing a preview, I see that the rectangle needs to be larger (but how much larger?).
• In preview mode, I Alt-PrintScrn, then paste the bitmap into xWD, then draw a 50% transparent rectangle over the table.
• I top-left align the Placeholder-rectangle and the semi-transparent rectangle, then do a 'Repel text under' for the semi-transparent unit.
• While the text repels nicely about the semi-transparent box, and the box appears to be the right size, it is misaligned with the Placeholder-rectangle. Why?