=WxH syntax for specifying image size is not working in some places

[damithc]

v1.17.2

Problem:
Consider ![](https://foo.io/logo.png =25x100). This way of specifying the image size works in some places (e.g., in a slot="header" fragment of a panel) but not in other places (e.g., normal body text)

This works!

[jovyntls]

It seems that the =WxH syntax is currently broken in panel headers too. In our UG Panels section:

(The "MarkBind" logo should be smaller, but it's rendered with its original size)

Tested with two different values for the =WxH syntax, both rendered the same size:

<panel header="**Bold text** :rocket: ![](https://vuejs.org/images/logo.png =10x10)" type="seamless">
  ...
</panel>
<panel header="**Bold text** :rocket: ![](https://vuejs.org/images/logo.png =20x20)" type="seamless">
  ...
</panel>

[jonahtanjz]

Could be an issue with the extension markdown-it-imsize. Last release was 7 years ago so some changes in markdown-it could have caused it to stop working.

[jovyntls]

The plugin markdown-it-linkify-images seems to be overriding markdown-it-imsize.

markdown-it-linkify-images only takes the src attribute so the width/height attributes (set by markdown-it-imsize) are removed.

EDIT: this seems to be fixed in v2.0 of the plugin - maybe we can update