d2js : in chrome, top-level await doesn't work with file:// URLs.

[bo-ku-ra]

protocol	firefox	chrome	edge(chromium)
file://	OK	NG	NG
http(s)://	OK	OK	OK

mermaid supports rendering diagrams from local files.
https://cdn.jsdelivr.net/npm/mermaid/dist/mermaid.esm.min.mjs

i hope d2 supports local files too.
https://esm.sh/@terrastruct/d2@nightly/es2022/d2.mjs

const d2 = new D2();
const result = await d2.compile(source);
const svg    = await d2.render(result.diagram, result.renderOptions);

[alixander]

I don't quite understand, can you give more details in the example?

[bo-ku-ra]

https://alixander-d2js.web.val.run/

D2.js Demo.html.txt
you will understand if you launch this HTML file (D2.js.Demo.html) locally.

[bo-ku-ra]

the cause may not be 'await', but rather 'cross-origin redirection'.