Markdown Card images cannot be resized. Worked in 2025.11 not working in 2025.12

[MankiniChykan]

Checklist

• I have updated to the latest available Home Assistant version.
• I have cleared the cache of my browser.
• I have tried a different browser to see if it is related to my browser.
• I have tried reproducing the issue in safe mode to rule out problems with unsupported custom resources.

Describe the issue you are experiencing

Markdown card does not allow changing the image size in 2025.12 but did in 2025.11.
Multiple users with the same problem

Describe the behavior you expected

With my current configuration I would expect the width and height in my card YAML configuration to remain the same

Steps to reproduce the issue

1. Update from 2025.11 to 2025.12

What version of Home Assistant Core has the issue?

2025.12.0

What was the last working version of Home Assistant Core?

2025.11.3

In which browser are you experiencing the issue?

Google Chrome

Which operating system are you using to run this browser?

Windows

State of relevant entities

Problem-relevant frontend configuration

type: markdown
content: >-
  <img src="https://brands.home-assistant.io/watchman/dark_logo.png" width="32" height="32">

JavaScript errors shown in your browser console/inspector

Additional information

The recent markdown changes have updated styles for img such that they are now height and width auto and max-width 100%. See Add markdown support for assist messages (#27957) · 4a90331 · GitHub

[karwosts]

I replaced your example with a much simpler/trivial example, didn't need all that extra card mod stuff and complex templates.

[MankiniChykan]

I replaced your example with a much simpler/trivial example, didn't need all that extra card mod stuff and complex templates.

No problems, I just pasted from my config.

[wesleyRaposo]

The problem isn't just with the image. The tables have also stopped working properly.

[Mariusthvdb]

Tables: we can take out the borders with a theme variable, but the additional padding’s can’t be removed..

[karwosts]

If you have a tables problem, please open a new issue with examples, etc. This issue is about images.

[wesleyRaposo]

If you have a tables problem, please open a new issue with examples, etc. This issue is about images.

It seems there are already other topics discussing the table. So, still talking about images, in version 2025.12.1 there's still a problem. The size configuration is no longer being respected when passed in the HTML tag. It used to work perfectly.

[attila123456]

The problem appears to be caused by the auto width and height values in the "constructed stylesheet" that override the values set in the img tag attributes:

img {
    background-color: var(--markdown-image-background-color);
    border-radius: var(--markdown-image-border-radius);
    max-width: 100%;
    height: auto;
    width: auto;
    transition: height 0.2s ease-in-out;
}

[wesleyRaposo]

Hello.
Does anyone know if the markdown card will be fixed to work as before?

I'm quite anxious and frustrated with this problem. I developed several (dozens) of custom dashboards using markdown because of its simplicity and reliability, and I can't update Home Assistant until they work again.

I still don't understand why they interfered with its functionality.

[wesleyRaposo]

They just released version 2025.12.2 and all the problems with the markdown card persist.

[wesleyRaposo]

@silamon
Could you tell me in which version or release this fix will be rolled out?
Thank you.

[silamon]

The next one that ships with a frontend release.