Permalink button in snapshot page doesn't work

[arai-a]

steps:

1. open https://arai-a.github.io/ecma262-compare/snapshot.html?rev=9a757821f26f66cf90cfb70a7dd3b285341d2682
2. click "COLLAPSE"
3. hover on "1" in "1 Scope" section
4. click "Permalink"

actual result: jumps to https://arai-a.github.io/ecma262-compare/history/9a757821f26f66cf90cfb70a7dd3b285341d2682/#sec-scope which is 404

expected result: jumps to https://arai-a.github.io/ecma262-compare/snapshot.html?rev=9a757821f26f66cf90cfb70a7dd3b285341d2682#sec-scope