### Bug description

The column width parameter seems to have stopped working.

It's not working with the current [5ca1740](https://github.com/quarto-dev/quarto-cli/commit/5ca1740bc5bb503a5e8c0f375889744aabde0864)... checking back in time... it also doesn't work here de145553da303d126fcf58294e2e2c968189be11 (pandoc 2.19) but it was working in the commit before that which used pandoc 2.18 5abea1a0387e282467ae96829725ddf84a23779e


```
---
title: "Untitled"
format: revealjs
---


:::: {.columns}

::: {.column width="20%"}
Left column (20%)
:::

::: {.column width="80%"}
Right column (80%)
:::

::::
```

### `quarto check` Output

_No response_

### `quarto tools check` Output

_No response_

### Checklist

- [X] [formatted your issue](https://yihui.org/issue/#please-format-your-issue-correctly) so it is easier for us to read?
- [X] included a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
- [X] documented the quarto version you're running, by pasting the output from running `quarto check` in the "Quarto Check Output" text area?
- [X] documented the version of the quarto tools you're running, by providing the output from running `quarto tools check` in the "Quarto Tools Check Output" text area?
- [X] documented the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [X] documented which operating system you're running? If on Linux, please provide the specific distribution as well.
- [X] upgraded to the latest version, including your versions of R, the RStudio IDE, and relevant R packages?
dragonstyle
2022-08-17T10:41:07Z
garthtarr
bug
v1.2
closed
Column issue
https://github.com/quarto-dev/quarto-cli/issues/1940