<link rel="apple-touch-icon"> failed to parse attribute value: variant not found

[jonfk]

i am trying to add an apple favicon with the following:

<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png"/>

But I am getting the following error at runtime.

ERROR: <link rel="apple-touch-icon"> failed to parse attribute value: Matching variant not found
ERROR: rebuild with nightly to print source location
thread 'main' panicked at 'failed to parse string literal', src/view.rs:4:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

From what I understand, it's trying to build a LinkType for the rel attribute of the link element and since apple-touch-icon isn't a valid variant of LinkType it's failing.

Is there an escape hatch where I can put custom attributes or attribute values so that I can bypass this error?