- 入力
- 言語コードとURLを1行に1組: en https://example.com/en it https://example.com/it
- x-defaultのURL（任意）: https://example.com/en
- 結果
- <link rel="alternate" hreflang="en" href="https://example.com/en"> <link rel="alternate" hreflang="it" href="https://example.com/it"> <link rel="alternate" hreflang="x-default" href="https://example.com/en">