Disabling the Astro dev toolbar on specific pages or instances

[randomguy-2650]

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Summary

This discussion proposes an addition of hiding or disabling the Astro dev toolbar on certain pages, or certain pages that are displayed on a separate instance, like an <iframe>.

Background & Motivation

If an Astro page is placed in src/pages and there is an <iframe> on a different page displaying that Astro page, there would be a dev toolbar in that “iframed page”, which doesn’t look correct. Some pages are intended to only be shown in an iframe anyways, so by having the ability to hide it on certain pages (via an attribute, Astro config setting, etc.) or in certain instances would be great.

Some people might just say to disable the dev toolbar entirely, but oftentimes, the dev toolbar is useful for basic a11y testing and maybe performance stuff as well as some debug log settings.

Goals

• Disable or hide the Astro dev toolbar on specific pages, like via an attribute or Astro config setting.