The document discusses how HTTPS helps protect the integrity and privacy of websites and users by preventing tampering with communications and passive listening. It also notes that HTTPS is important for the future of the web and new features. The document then provides information on cookie attributes like SameSite, Secure, and Path that help secure cookies. It covers cross-origin policies like COOP and COEP that enable cross-origin isolation and related concepts like CORP and CORS. The document gives steps to enable cross-origin isolation and check that resources support CORP/CORS. It emphasizes applying CORP headers to resources and warns that without CORP, resources may get blocked. Finally, it shows code to check if a page is cross-origin isolated and

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2. Web Privacy & Security Recipes
Mark Robin
Senior Software Engineer
Inspire Team
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4. https://
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5. Protects the integrity of your
website
HTTPS
HTTPS helps prevent intruders from
tampering with the communications
between your websites and your users'
browsers.
Protects the privacy & security
of your users
HTTPS prevents intruders from being
able to passively listen to
communications between your
websites and your users.
The future of the web
HTTPS is a key component to the
permission workflows for new features
and updated APIs.
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6. Protects the privacy & security
of your users
HTTPS prevents intruders from being
able to passively listen to
communications between your
websites and your users.
Protects the integrity of your
website
HTTPS
HTTPS helps prevent intruders from
tampering with the communications
between your websites and your users'
browsers.
Protects the privacy & security
of your users
HTTPS prevents intruders from being
able to passively listen to
communications between your
websites and your users.
The future of the web
HTTPS is a key component to the
permission workflows for new features
and updated APIs.
GDG Cebu
Protects the integrity of your
website
HTTPS helps prevent intruders from
tampering with the communications
between your websites and your users'
browsers.

7. Protects the integrity of your
website
HTTPS
HTTPS helps prevent intruders from
tampering with the communications
between your websites and your users'
browsers.
Protects the privacy & security
of your users
HTTPS prevents intruders from being
able to passively listen to
communications between your
websites and your users.
The future of the web
HTTPS is a key component to the
permission workflows for new features
and updated APIs.
GDG Cebu
Protects the privacy & security
of your users
HTTPS prevents intruders from being
able to passively listen to
communications between your
websites and your users.
The future of the web
HTTPS is a key component to the
permission workflows for new features
and updated APIs.

8. www.iliketoquote.com

10. Cookie recipes:
SameSite and beyond
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11. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=Lax
Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=Lax
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12. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=Lax
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13. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=Lax
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14. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=Lax
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15. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=Lax
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16. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=Lax
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17. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=Lax
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18. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=Lax
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19. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=Lax
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20. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=Lax
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21. Set-Cookie:
__Secure-cookiename=cookievalue;
Secure;
Domain=news.site;
Path=/;
HttpOnly;
SameSite=Lax
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22. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=Lax;
Max-Age=900
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23. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=Strict
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24. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=None
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25. Set-Cookie:
__Host-cookiename=cookievalue;
Secure;
Path=/;
HttpOnly;
SameSite=None
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26. Set-Cookie:
first_party=cookievalue;
SameSite=Lax
Set-Cookie:
third_party=cookievalue;
SameSite=None; Secure
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27. COOP:
COEP:
Cross-Origin-Opener-Policy
Cross-Origin-Embedder-Policy
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28. Powerful Features
• SharedArrayBuffer across platforms
• performance.measureMemory()
• JS Self Profiling API
and more to come…
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29. Composability
● Ads
● Fonts
● Images
● Videos
● Maps
● Payment solutions
a.example
b.example
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30. Same-origin Policy
a.example
b.example
Browsing Context Group
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31. Same-origin Policy
Origin A Origin B
Explanation of whether Origin A
and B are "same-origin" or
"cross-origin"
https://www.example.com:443
https://www.evil.com:443 cross-origin: different domains
https://example.com:443 cross-origin: different subdomains
https://login.example.com:443 cross-origin: different subdomains
http://www.example.com:443 cross-origin: different schemes
https://www.example.com:80 cross-origin: different ports
https://www.example.com:443 same-origin: exact match
https://www.example.com same-origin: implicit port number (443)
matches
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32. Spectre
evil.example
Browsing Context Group
a.example
b.example
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33. COOP+COEP = cross-origin isolated
evil.example
a.example
b.example
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34. Enabling cross-origin isolation
1. Set `Cross-Origin-Opener-Policy: same-origin` for the main
document.
2. Make sure cross-origin resources use `CORP: cross-origin` or CORS.
3. Set `Cross-Origin-Embedder-Policy: require-corp` for the main
document.
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35. Cross-Origin-Opener-Policy: same-origin
COOP COEP CORP CORS
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36. Confirm cross-origin resources support:
COOP COEP CORP CORS
• `Cross-Origin-Resource-Policy: cross-origin` header
• Cross Origin Resource Sharing
`<img src=“image.png” crossorigin>`
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37. Attention! Resource providers:
COOP COEP CORP CORS
Apply `Cross-Origin-Resource-Policy: cross-origin` header!
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38. Cross-Origin-Embedder-Policy: require-corp
Resource without `CORP` or CORS will be blocked
COOP COEP CORP CORS
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39. Cross-Origin-Embedder-Policy: require-corp
Cross-origin resource with `CORP: cross-origin` can be loaded
COOP COEP CORP CORS
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40. ```js
if (self.crossOriginIsolated) {
// Your page is at "cross-origin isolated" state
}
```
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41. Chrome DevTools
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43. Issues Tab
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46. GDG Cebu

47. This cover has been designed using
resources from Freepik.com
Security is always excessive
until it’s not enough.
Robbie Sinclair

48. linkedin.com/in/markdrobin
github.com/mdrobin95
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SOURCE web.dev/secure