I can't embed code


<iframe width="638" height="485" class="" src="//docs.google.com/forms/d/e/1FAIpQLSc7iSbnunlN5ezShrS6F6RLzijNGjOiUKprMhOB4t-yy3aYTQ/viewform?embedded=true" data-src="//docs.google.com/forms/d/e/1FAIpQLSc7iSbnunlN5ezShrS6F6RLzijNGjOiUKprMhOB4t-yy3aYTQ/viewform?embedded=true" frameborder="0" marginheight="0" marginwidth="0">Loading...</iframe>

<iframe style="border-radius:12px" src="https://open.spotify.com/embed/playlist/3vSBfEbFI7ibhqjEORjEFC?utm_source=generator" width="100%" height="352" frameBorder="0" allowfullscreen="" allow="autoplay; clipboard-write; encrypted-media; fullscreen; picture-in-picture" loading="lazy"></iframe>

Even though the code preview worked, once it was done it disappeared
Yeah its disappeared

I'm a coder and I realized that:
The use of inline CSS style within the iframe tag is not supported in HTML. The correct way to apply styled to an iframe is to use and external CSS file or define the styles in a <style> tag within the head section of the HTML Additionally, the specific style attribute "border-radius" is not typically supported on iframes. If you want to apply border radius to the iframe, you should wrap it up in a container element like a div and apply the border radius to that container instead.
What language is that-

I'm a coder and I realized that:
The use of inline CSS style within the iframe tag is not supported in HTML. The correct way to apply styled to an iframe is to use and external CSS file or define the styles in a <style> tag within the head section of the HTML Additionally, the specific style attribute "border-radius" is not typically supported on iframes. If you want to apply border radius to the iframe, you should wrap it up in a container element like a div and apply the border radius to that container instead.
Spoken like a true coder. Only the people who code know what HTML stands for but I agree and more problems will occur if you don't know what this is as this what your device runs off of since your GPU (or Graphics processing unit) needs you need code for it to work and if your GPU doesn't work then the CPU (or Central Processing Unit) can't function and the others can't work like your RAM (or Random Access Memory) and the rest of your device will fail to work as well so yea that is one big paragraph

what type of code was it?html,python or what?and where did you embed it?maybe save it as a file and import it that way?that way even if it disappears its nice and convenient to have it in a drive so you can try multiple times

what type of code was it?html,python or what?and where did you embed it?maybe save it as a file and import it that way?that way even if it disappears its nice and convenient to have it in a drive so you can try multiple times
it is html + css.

ohh I know what html stands for.hypertext someting link?
html stands for hypertext markup language