uefa.com - blank page

[Enobarbous]

Clear PM 33.2.0
Site: https://www.uefa.com/
What it says on the can - just a blank page instead of a site.
In the console:

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ReferenceError: FinalizationRegistry is not defined

If this is what is described on the mdn (FinalizationRegistry, ff79+), then.... why? WHY? WeakRef wasn't enough and you need another way to kill yourself on GC?

[Moonchild]

Note: Cleanup callbacks should not be used for essential program logic. See Notes on cleanup callbacks for details.

We can't fix stupid.

[Enobarbous]

We can't fix stupid.

Honestly, I don't expect it to be implemented. It just bruised my brain so much that the report seemed like a good idea...

[Moonchild]

You should write uefa.com and tell them the issue.
The fact that they apparently rely on this in critical page logic needs to be addressed by them. The whole point is that there is absolutely 0 guarantee that the FinalizationRegistry callbacks will ever be called even in a browser that fully supports this nonsense, so it's literally completely pointless to even make use of it. The page might as well not have the code and the end result would literally be exactly the same.

[adoxa]

A workaround via Modify HTTP Response.

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[["www.uefa.com",["/CompiledAssets\\/UefaCom\\/js\\/base\\.js/",["new FinalizationRegistry(G=>{this.cache.get(G)?.deref()||this.cache.delete(G)})","{register:()=>{},unregister:()=>{}}","/new WeakRef\\((..)\\)/g","{deref:()=>$1}"]]]]

There are other issues: the slider > arrows don't work; "Our work in action" is displayed totally wrong (probably an aspect-ratio or min CSS problem).