Improve cross-origin isolation related documents

[agektmr]

Improves cross-origin isolation related documents

• https://web.dev/coop-coep
• https://web.dev/cross-origin-isolation-guide

Here's list of changes:

• Add report only mode step in the guide to recursively apply COEP to iframes.
• Add explanation about allow="cross-origin-isolated" to enable SharedArrayBuffer etc within an iframe.
• Add instructions how to check iframe and popup window's status of cross-origin isolation on DevTools.

[chrome-devrel-review-bot]

Hello! This is an automated review by our custom reviewbot. It updates automatically when code or GitHub comments in this pull request are created or updated.

Staging URLs

For your convenience, here are direct links (on our staging site) to the content you created or updated:

• https://deploy-preview-4693--web-dev-staging.netlify.app/coop-coep/
• https://deploy-preview-4693--web-dev-staging.netlify.app/cross-origin-isolation-guide/

Requested changes

If there are any common problems with the content files you created or modified, they will be listed here.

src/site/content/en/blog/coop-coep/index.md

• Please break lines at 100 characters maximum. Long lines can be difficult to work with in GitHub's pull request UI. The following tools can help speed up the process: Rewrap (VS Code), Docs To X (Google Docs; only available for Googlers). Affected lines: 129, 230, 236, 246, 252, 333, 347, 418, 441, 463, 475
• Please change your usage of the following words:
  • Avoid please. Affected lines: 321

src/site/content/en/secure/cross-origin-isolation-guide/index.md

• This file passed all of our automated Markdown audits.

[github-actions]

Alex Recommends Report

Alex recommends the following language changes, but Alex is a regular expression based algorithm, so take them with a grain of salt.

src/site/content/en/blog/coop-coep/index.md

Level	Location	Word	Recommendation
⚠️	52:62	disabled	disabled may be insensitive, use turned off, has a disability, person with a disability, people with disabilities instead
⚠️	214:75	easy	easy may be insensitive, try not to use it
⚠️	459:74	special	special may be insensitive, use has a disability, person with a disability, people with disabilities instead

src/site/content/en/secure/cross-origin-isolation-guide/index.md

Level	Location	Word	Recommendation
⚠️	29:73	just	just may be insensitive, try not to use it

[netlify]

Deploy preview for web-dev-staging ready!

Built with commit 394e269

https://deploy-preview-4693--web-dev-staging.netlify.app

[agektmr]

@lutzvahl can you review these changes?

[agektmr]

You can see the prevews at

• https://deploy-preview-4693--web-dev-staging.netlify.app/coop-coep/
• https://deploy-preview-4693--web-dev-staging.netlify.app/cross-origin-isolation-guide/

[kaycebasques]

@agektmr merge yourself when ready please

[lutzvahl]

LGTM content wise