remote:

remote:

[1] remote:URL scheme です。

[2] <iframe> - HTML | MDN ( ( 版)) <https://developer.mozilla.org/en-US/docs/HTML/Element/iframe>

[3] Using the browser API - Web API Interfaces | MDN ( ( 版)) <https://developer.mozilla.org/en-US/docs/Web/API/Using_the_Browser_API>