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Copying my comments that I added to PR #181 since it was merged:

@Rich-Harris

Sorry, I dropped the ball here, meant to review this PR sooner. I think we should revert it, so I've opened #187. The back/forward buttons in this PR cause the iframe to be reloaded, which gives a very misleading impression of how history navigation works in SvelteKit. It's better to not have history UI than to have UI that causes full page reloads

@Rich-Harris, I think the reload is primarily caused by the iframe being removed and re-added to the screen and how that change interacts with the bwd/fwd history changes.

According to the comment inside the set_iframe_src function…

/** @param {string} path */
function set_iframe_src(src) {
  // removing the iframe from the document allows us to
  // change the src without adding a history entry, which
  // would make back/forward traversal very annoying
  const parentNode = /** @type {HTMLElement} */ (iframe.parentNode);
  iframe.classList.remove('loaded');
  parentNode?.removeChild(iframe);
  iframe.src = src;
  parentNode?.appendChild(iframe);
}

…removing the iframe altogether and re-injecting it to the page is supposed to "change the src without adding a history entry" though I do not see that actually working in Chrome, even before my PR. Does that work in other browsers? As I navigate around one iframe, I still have to click the browser's back button repeatedly to traverse through every navigation from the iframe.

I can confirm that removing the set_iframe_src function and swapping its usage for iframe.src = resolves this issue, though again, I can't speak to whether any browsers were actually benefitting from set_iframe_src.

Let's go ahead and revert this PR for now, and either re-open this PR or I can create a new PR that builds on this one and addresses those concerns.

cc @dummdidumm

@Rich-Harris @dummdidumm One idea here which might remove much of the complexity around this is to sync the iframe history/URL state with the browser's so that as the iframe's URL changes, there could be URL param in the browser like frame_src=${path} so that clicking back in the browser or the iframe essentially trigger the same action and go back one step whether in the iframe or the browser depending on the user's actions. Of course, it would be better to just completely isolate the iframe's history apart from the browser's, but in all my testing and research, there doesn't appear to be a way to achieve that, including the "removing/adding the iframe node" hack.

I'm not sure if/how/where/when set_iframe_src work(ed), as described in its comment to avoid adding an entry to the browser's history. I'm honestly not criticizing it—it may work in some places—it just hasn't worked in my testing, which granted was limited to Chrome.

heads up: when #189 is merged code will be shuffled around quite a bit, your code would go into Output.svelte then

Oops, well I didn't intentionally close this PR. Probably happened automatically when I re-synced with the latest master. I'll open a new one with the changes.