Document 64 KiB payload limit for sendBeacon()

[codersjj]

Description

Document the 64 KiB payload size limit for sendBeacon() and clarify browser-specific implementation differences.

Motivation

Additional details

• Fetch specification reference: HTTP-network-or-cache fetch defines the 64 KiB limit for keepalive requests
• Firefox bug 2008613

Related issues and pull requests

Fixes #42932

Relates to mdn/browser-compat-data#20721

[github-actions]

Preview URLs (1 page)

• /en-US/docs/Web/API/Navigator/sendBeacon

External URLs (1)

URL: /en-US/docs/Web/API/Navigator/sendBeacon
Title: Navigator: sendBeacon() method

• https://fetch.spec.whatwg.org/ (1 time) (Note! This may be a new URL 👀)

[wbamberg]

Thanks for your PR. However it is incredibly verbose, documented in the wrong place, and not integrated into the page in a sensible way. It looks to me like this is just the output of an LLM, without any real thought about how it should be integrated into the page.

I'm going to close it, because I don't want to encourage contributors to file PRs like this.

[codersjj]

Thanks for the feedback, @wbamberg!
I agree the addition was too verbose and poorly integrated—sorry about that. I'll submit a tighter, better-placed version.