There are likely a number of ways to accomplish what you want. The problem with just wrapping these blocks with anchors is that nested anchors make a mess, and browsers likely won't render everything like you expect.

Python Markdown md_in_html handling can sometimes have issues as it expects Markdown HTML blocks to be at the root level of a document. Sometimes it works well enough, but under nested constructs like lists, admonitions in the style of !!! "admonition", etc. HTML markdown blocks may not always work as expected.

There is this extension (https://facelessuser.github.io/pymdown-extensions/extensions/blocks/plugins/html/) which works generally better in these situations.

div class="grid cards" markdown>

-   
    /// html | div[onclick="window.location.href='#;" style="cursor: pointer"]
    :material-clock-fast:{ .lg .middle } __Set up in 5 minutes__

    ---

    Install [`mkdocs-material`](#) with [`pip`](#) and get up
    and running in minutes

    [:octicons-arrow-right-24: Getting started](#)
    ///

...

Granted, I still wouldn't use sublinks as they'll be overridden by the div link, but it will render well.

Again, there are likely other approaches as well.

I imagine there may be changes in the future foundational work that may make this easier or more intuitive, but I have no idea, as it isn't available yet: #8461