1. fetch api: `init.priority` parameter

2. htmlimageelement api: fetchpriority

3. htmllinkelement api: fetchpriority

4. htmlscriptelement api: fetchpriority

5. html element: img: fetchpriority

6. html element: link: fetchpriority

7. html element: script: fetchpriority

8. headers http header: link: fetchpriority

9. svg element: feimage: fetchpriority

10. svg element: image: fetchpriority

11. svg element: script: fetchpriority