2025.12 Markdown changes, and how to mitigate

Configuration Frontend
2

I’ve been using html tables in Markdown cards for a while, and have never been able to successfully style them within the html code itself.

So I’ve always had to resort to card_mod, which has been 100% reliable until the 2025.12.0 betas.

The required Dom paths seem to have changed, and I think I’ve got that sorted, but now often the styling isn’t shown on first load, but needs a refresh from the dashboard menu.

I’ve tried using the advised card_mod tricks - line breaking the Dom path on each shadow-root, using prepend: true, but without it making a difference.

I’m also finding that styles aren’t applied on Markdown cards within a closed expander card on first open. Works on second open though.

Here’s a semi-working code sample:

type: markdown
card_mod:
  prepend: true
  style:
    ha-markdown $:
      ha-markdown-element: |
        table {
          width: 100%;
        }
        td {
          border: none;
          padding: 0px;
          vertical-align: middle;
        }