Amphtml: amp-reddit embeds don't resize correctly

[Cauchon]

What's the issue?

amp-reddit embeds isn't resizing the height of the Reddit embed correctly, causing the bottom of the Reddit embed to get cut off

How do we reproduce the issue?

If this is a bug please provide a public URL and ideally a reduced test case (e.g. on jsbin.com) that exhibits only your issue and nothing else. Then provide step-by-step instructions for reproducing the issue:

1. Use amp-reddit
2. Load AMP document using Chrome Inspector
3. Toggle Device Toolbar and view the AMP doc as an iPhone 5 and iPhone 6
4. Notice that the bottom of the Reddit embed is cut off.

Example: http://cauchon.co/reddit.html

What browsers are affected?

All browsers

Which AMP version is affected?

AMP ⚡ HTML – Version 1508794187431
amp-reddit-0.1.js

I believe this has always been broken

[dvoytenko]

/to @jridgewell ptal

[jridgewell]

There doesn't appear to be any communication between the embed's inner iframe and the embed. I'm not sure how we can support this.

/cc @samiamorwas, who wrote the amp-reddit extension.

[samiamorwas]

I believe I ran into this issue myself, and couldn't find any way to support it at the time.

[ampprojectbot]

This issue hasn't been updated in awhile. @jridgewell Do you have any updates?

[johnnyshankman]

Ran into this today, would love to see if this is on the schedule for fixing.

[jridgewell]

It's not prioritized. We'd need someone from reddit to help us figure out their iframe API.

[johnnyshankman]

Hm alright. Well I guess I'll subscribe to this issue and check back in the future.

My team will punt on implementing <amp-reddit> for now since there's no reliable way to find the proper aspect ratio from the embed code (for dynamically setting height and width properties) and we can't have broken-looking embeds on the site.

Thanks for the quick response @jridgewell !

[Cauchon]

I just reached out to a contact at Reddit to see if they could send this to the right team for feedback.

[jridgewell]

Thanks @Cauchon!

[Cauchon]

Update from Reddit:

I checked in with Embedly, the company that powers our post embeds. They noted they're investigating some issues with Google AMP, so they're looking into this. If it's useful to the AMP team in the meantime, they provided their documentation on how Embedly iframes communicate resize requests with the pages that support their height resizing: http://docs.embed.ly/v1.0/docs/provider-height-resizing
I'll circle back when I have more info. Thanks!

[jridgewell]

WOO! We can work with http://docs.embed.ly/v1.0/docs/provider-height-resizing!

Passing this to @aghassemi

[aghassemi]

Thanks @jridgewell and @Cauchon. (a related but separate FYI: We are also working on a generic amp-embedly-card component #14819 )

/to @nainar, Looks like we can now receive resize events and call updateDimensions similar to other embeds.

[aghassemi]

Fixed by https://github.com/ampproject/amphtml/pull/15530

[johnnyshankman]

@aghassemi I'm still having issues with this embed not resizing its own height correctly and being cut-off or too tall.

Here's a JSFiddle showing the issue where it is cut off too soon.

I also noticed an edge case where when I resize the window, suddenly it goes from being cut off to being too tall.

Is this expected behavior w/ my embed setup or this possibly a bug with the new implementation? Did I miss something in my JSFiddle?

[aghassemi]

/to @nainar see comment above from @johnnyshankman . #15530 is in production.

[nainar]

Hi @johnnyshankman, first of all sorry that your initial complain fell through the cracks on my end.

Looking at your demo link. The aspect ratio you have specified is too small which is why the component is being cut off since layout is marked as responsive which respects the aspect ratio you provided.

If you increase the component's height so that it is say 475px to match the width of 300px then the component has an aspect ratio retains the content without cutting it off.
AMP layout=responsive isn't really "responsive" per say as can be seen here: #13872. It is instead sized to 100% width of parent and height auto per aspect ratio. There is an open issue to fix this but as a work around setting a larger height to get a correct aspect ration ought to work.

[nainar]

Closing this as per previous comment, please file any new feedback as issues. Thank you!

[johnnyshankman]

@nainar thank you. We'll have to only use reddit embeds where we can assert the aspect ratio ahead of time.

[dermatzi]

i am confused that reddit itself offers an "amp-iframe" tag when getting the embed code for a post. why would they not use their own amp-reddit tag?
also i notice, that the responsive resize of reddit's amp-iframe works fine ("resizable" attribute).
so why not simply implementing the "resizable" attribute for the amp-reddit tag?

[mehigh]

If you use amp-embedly-card component instead of the amp-reddit one you won't have to fill in the aspect ratio ahead of time.
The generic component mentioned earlier (here's the link again: https://github.com/ampproject/amphtml/pull/14819) works perfectly for this purpose.

<amp-embedly-card
    data-url="https://www.reddit.com/r/..."
    layout="responsive"
    width="100"
    height="100"
    data-card-controls="0">
</amp-embedly-card>

[mehigh]

I've created a pull request against the WordPress plug-in to use the amp-embedly-card. Maybe the amp-reddit component needs to not be recommended any longer in the main documentation and recommend embedly instead, as I imagine it would be very difficult to propagate iframe resizing in the current approach where an iframe contains the embedly iframe.

[westonruter]

@nainar This issue should be re-opened. The issue is that the amp-reddit component's iframe is not resizing itself as it should be, while the amp-embedly-card is. Compare the following, with 100x10 dimensions to exaggerate the point:

  <p>
    <code>amp-reddit</code>:
  </p>
  <amp-reddit
      layout="responsive"
      data-embedtype="post"
      width="100"
      height="10" 
      data-src="https://www.reddit.com/r/me_irl/comments/52rmir/me_irl/?ref=share&amp;ref_source=embed">
  </amp-reddit>
  <p>
    <code>amp-embedly-card</code>:
  </p>
  <amp-embedly-card
      data-url="https://www.reddit.com/r/me_irl/comments/52rmir/me_irl/"
      layout="responsive"
      width="100"
      height="10">
  </amp-embedly-card>

This is getting rendered as:

Notice that the amp-reddit is not resizing like the amp-embedly-card is.

Perhaps there is a discrepancy between the way these two components are sending the resize messages:

https://github.com/ampproject/amphtml/blob/873708f6b990faae256a24a2b22be34c071d03f3/3p/reddit.js#L86-L91

https://github.com/ampproject/amphtml/blob/873708f6b990faae256a24a2b22be34c071d03f3/3p/embedly.js#L101-L115

The code in reddit.js is not working while the code in embedly.js apparently is.

The initial dimensions for this component should be intended for any placeholder content or a best guess as to what the dimensions will be. The actual dimensions should be determined by the component upon load, just like amp-gist:

[mehigh]

Actually reddit mentioned they are using embedly for embeds. When inspecting the reddit amp embed you can see it's an iframe with another iframe inside of it (maybe it's an embedly inside of a reddit frame).

[jridgewell]

Is it possible to rewrite the reddit component to use embedly now that it's the recommended way?

[mehigh]

Or just deprecate the amp reddit component and document the recommendation
for embedly?

On Wed, May 22, 2019, 23:49 Justin Ridgewell [e-mail]
wrote:

Is it possible to rewrite the reddit component to use embedly now that
it's the recommended way?

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[jridgewell]

That would be fine, too. But if it's possible to just upgrade the current <amp-reddit layout="responsive" data-embedtype="post" width="100" height="10" data-src="..."> </amp-reddit> to use embedly under the hood, all current users of <amp-reddit> would get a better experience without having to do anything.

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