After adding an embedded Gist in my WP post, all I see when fetching it through REST API is the embed code, meaning <script src="https://gist.github.com/username/b5f6f2d0xxxxxxxdf9c90cbede0e.js"></script>.

There are solutions to properly render an embedded Gist in WordPress but these solutions work on a WordPress site, not on a non-WP site merely fetching posts from WP.

Any idea how to solve this issue?

EDIT: As per this suggestion, I tried to extract the script tag from the post and re-inject it into the DOM. But, it still doesn't work. Actually even when simply loading my Gist script into a variable then injecting the content into the DOM, it doesn't work. Yet it works with any other script, for example this:

const tag = document.createElement('script');
tag.src = 'https://fabricepallaud.com/test.js';
document.querySelector('body').prepend(tag);

But the exact same snippet using instead my Gist URL fails to execute.

Why don't Gist scripts execute when injected into the DOM?

After adding an embedded Gist in my WP post, all I see when fetching it through REST API is the embed code, meaning <script src="https://gist.github.com/username/b5f6f2d0xxxxxxxdf9c90cbede0e.js"></script>.

There are solutions to properly render an embedded Gist in WordPress but these solutions work on a WordPress site, not on a non-WP site merely fetching posts from WP.

Any idea how to solve this issue?

EDIT: As per this suggestion, I tried to extract the script tag from the post and re-inject it into the DOM. But, it still doesn't work. Actually even when simply loading my Gist script into a variable then injecting the content into the DOM, it doesn't work. Yet it works with any other script, for example this:

const tag = document.createElement('script');
tag.src = 'https://my-site.com/test.js';
document.querySelector('body').prepend(tag);

But the exact same snippet using instead my Gist URL fails to execute.

Why don't Gist scripts execute when injected into the DOM?

After adding an embedded Gist in my WP post, all I see when fetching it through REST API is the embed code, meaning <script src="https://gist.github.com/username/b5f6f2d0xxxxxxxdf9c90cbede0e.js"></script>.

There are solutions to properly render an embedded Gist in WordPress but these solutions work on a WordPress site, not on a non-WP site merely fetching posts from WP.

Any idea how to solve this issue?

After adding an embedded Gist in my WP post, all I see when fetching it through REST API is the embed code, meaning <script src="https://gist.github.com/username/b5f6f2d0xxxxxxxdf9c90cbede0e.js"></script>.

There are solutions to properly render an embedded Gist in WordPress but these solutions work on a WordPress site, not on a non-WP site merely fetching posts from WP.

Any idea how to solve this issue?

EDIT: As per this suggestion , I tried to extract the script tag from the post and re-inject it into the DOM. But, it still doesn't work. Actually even when simply loading my Gist script into a variable then injecting the content into the DOM, it doesn't work. Yet it works with any other script, for example this :

const tag = document.createElement('script');
tag.src = 'https://fabricepallaud.com/test.js';
document.querySelector('body').prepend(tag);

But the exact same snippet using instead my Gist URL fails to execute.

Why don't Gist scripts execute when injected into the DOM?