Canvas “Add web page” on iPad virtually never renders a web page

[robertandrews]

Ever since Canvas launched, when used on iPad, it basically never renders a web page.

Example URL - Birkenstock: Once-uncool sandal maker now worth billions - BBC News

I’m surprised to see this is still the case after several version revisions and, if I recall correctly, one iPadOS upgrade.

This bug was previously reported, but closed - Canvas web embeds are not rendered on mobile - #3 by ArthurFr

Some web pages render, but I can’t determine the logic/reason for others not.

[WhiteNoise]

The reason why this happens is explained in the thread you linked.

Canvas web embeds are not rendered on mobile

On desktop, we are able to render websites using a custom Electron tag called <webview>. This renders websites in a separate thread and is essentially a true “embedded” site. On mobile, we use a separate architecture instead of Electron so we are falling back to iframes. Iframes have a lot of shortcomings, the main one being that many websites block being loaded as an iframe. Sadly I don’t see us being able to fix this.

[robertandrews]

Ah, I missed that - thanks.
Is the sandbox <iframe> attribute with eg. allow-scripts valuable here?

[WhiteNoise]

@robertandrews

Is the sandbox <iframe> attribute with eg. allow-scripts valuable here?

it is not.