We explored postMessages for a bit, too. IIUC, this would only solve the success case properly though. But how do we know the iframe is broken? Not receiving the postMessage could also mean the iframe hasn't completed loading yet.
On Wed, Nov 17, 2021 at 11:34 AM Domenic Denicola <dome...@chromium.org> wrote: > The "error" event does not fire on iframes though, precisely because we > don't want to leak information cross-origin. > > Pages generally deal with broken iframes, in cases where they need to, by > noticing that the iframe has not sent them the message they expect. (Via > parent.postMessage() from inside the iframe.) That is, they use an opt-in > protocol where the iframed page must affirmatively decide what information > to send cross-origin. > > On Wed, Nov 17, 2021 at 2:24 PM Daniel Cheng <dch...@chromium.org> wrote: > >> The iframe element supports "load" and "error event listeners. Is the >> exact HTTP error needed? Or does the feature just need to know if it >> succeed or not? >> >> Daniel >> >> On Wed, 17 Nov 2021 at 11:19, Tibor Goldschwendt <tib...@chromium.org> >> wrote: >> >>> +Nasko Oskov <na...@chromium.org> >>> >>> Thanks, Kahmy. Adding custom code in the browser process is another >>> avenue I'm exploring. Generally though, how do pages deal with broken >>> iframes? >>> >>> On Wed, Nov 17, 2021 at 6:39 AM K. Moon <km...@chromium.org> wrote: >>> >>>> This would violate the same-origin policy, so I don't think you can do >>>> this within Blink, but given this is a chrome: page, maybe you could add >>>> some code in the browser to give this information to you. >>>> >>>> On Tue, Nov 16, 2021, 4:40 PM Tibor Goldschwendt <tib...@chromium.org> >>>> wrote: >>>> >>>>> Hi Blink Dev! >>>>> >>>>> Is there any way to get the HTTP return code of a cross-domain iframe? >>>>> FWIW, the hosting page has the chrome:// scheme while the iframe has >>>>> https:// scheme. From my limited testing I receive the load >>>>> <https://developer.mozilla.org/en-US/docs/Web/API/Window/load_event> event >>>>> in all scenarios but couldn't find a way to query whether the load >>>>> succeeded. I also tried window.addEventListener('error', ...) and >>>>> iframe.addEventListener('error', ...) without any luck. >>>>> >>>>> Best regards, >>>>> Tibor >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "blink-dev" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to blink-dev+unsubscr...@chromium.org. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFgr3n%2B8i%2BNQNSJY0DFab9JrXG0QTq3W473t-beRtPYbLn1XjA%40mail.gmail.com >>>>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFgr3n%2B8i%2BNQNSJY0DFab9JrXG0QTq3W473t-beRtPYbLn1XjA%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- >>> You received this message because you are subscribed to the Google >>> Groups "blink-dev" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to blink-dev+unsubscr...@chromium.org. >>> To view this discussion on the web visit >>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFgr3nL-J4A0bQuXnU1Ns-eUYLNqVV65KZLeY3HuiPuBYQQmiQ%40mail.gmail.com >>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFgr3nL-J4A0bQuXnU1Ns-eUYLNqVV65KZLeY3HuiPuBYQQmiQ%40mail.gmail.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "blink-dev" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to blink-dev+unsubscr...@chromium.org. >> To view this discussion on the web visit >> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAF3XrKpDqd9ixPDOFiOu7NjMpmMm62nD0JxzBxyHfLmTJhr0PA%40mail.gmail.com >> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAF3XrKpDqd9ixPDOFiOu7NjMpmMm62nD0JxzBxyHfLmTJhr0PA%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFgr3nJzcGrJtpCvBavAcxokEA_0O_W9CznDQsR3wwUtZLAGMw%40mail.gmail.com.
