How do I add a table onto my site?

This is one of the most obvious basic functionality gaps in Squarespace

You need insert your code using Content Blocks -> Block Code in the place or section where you want add your table.

this block support style, html code and script in the same block

I did that. I inserted the CSS into the header and the HTML into a code block. It is only listing the info. in the cells in columns and rows. It's completely ignoring the formatting of the CSS.

No bro you need insert in Code Block not in Code Injection

I insert the CSS code into the code block too? I thought it goes in the header?

I'm putting the HTML in the code block.

I so agree, and I've seen many posts where you've commented. I've been trying to use your workarounds, but I can't get them to work. :-(

Gave it a shot, and it worked! Thank you, jpurata!