Does it support all URL schemes?

Yes. Any URL the browser’s native URL() constructor accepts - http, https, ftp, mailto, data, file, custom schemes, etc. Relative URLs need a base.

What is the difference between host and hostname?

Hostname is just the domain (example.com). Host includes the port if present (example.com:8080).

Using URLSearchParams. Values are automatically URL-decoded. Duplicate keys are kept separately - both ?a=1&a=2 pairs are shown.

Protocol + host (+ port) combined: https://example.com:8080. It is what the browser uses to enforce the same-origin security policy.

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Does it support all URL schemes?: Yes. Any URL the browser’s native URL() constructor accepts - http, https, ftp, mailto, data, file, custom schemes, etc. Relative URLs need a base.
What is the difference between host and hostname?: Hostname is just the domain (example.com). Host includes the port if present (example.com:8080).
How are query parameters parsed?: Using URLSearchParams. Values are automatically URL-decoded. Duplicate keys are kept separately - both ?a=1&a=2 pairs are shown.
What is the origin field?: Protocol + host (+ port) combined: https://example.com:8080. It is what the browser uses to enforce the same-origin security policy.