Element login page has been eaten by the background

[Half-Shot]

https://riot.im/app shows the login screen being eaten by some blurs. Looks like some dodgy CSS.

Servo:

[nicoabie]

This is the console output which has some hints

ngallinal@ITs-Mac-mini-2 servo % ./mach run https://riot.im/app
Browser missing feature: '%s' objectfit
Browser missing feature: '%s' object-fit
Browser missing feature: '%s' svg
Browser missing feature: '%s' svgfilters
Browser missing feature: '%s' crypto
Initialised rageshake.
To fix line numbers in Chrome: Meatball menu → Settings → Blackboxing → Add /rageshake\.js$
Using Web platform
returning theme value
returning theme value
Loading skin...
Using WebAssembly Olm
set language to en-us
Starting watcher for TagPanel.disableTagPanel@<null room> as ID 1595788248095_1_TagPanel.disableTagPanel_null
👋 legacy room list store has been disabled
⚡ new room list store engaged
Starting watcher for feature_custom_tags@<null room> as ID 1595788248142_2_feature_custom_tags_null
Starting watcher for breadcrumb_rooms@<null room> as ID 1595788248208_3_breadcrumb_rooms_null
Starting watcher for breadcrumbs@<null room> as ID 1595788248208_4_breadcrumbs_null
Skin loaded!
Browser is missing required features.
[2020-07-26T18:30:48Z ERROR script::dom::bindings::error] Error at https://riot.im/app/bundles/2bf2e97955bd40c82b34/vendors~init.js:2:4495571 'image/svg+xml' is not a valid enum value for enumeration 'SupportedType'.

macOS 10.15.6 built with b83433f

[atouchet]

I get an "unsupported browser" warning when I try to load the page. I opened a PR to update Servo's user agent string to see if that fixes that problem. If I skip the warning I get similar issues to the ones in the original post.