feat(js): Add propagateTraceparent option documentation

[Lms24]

DESCRIBE YOUR PR

To be merged after getsentry/sentry-javascript#17509 was released

This PR adds documentation for the new, browser-SDK-only, propagateTraceparent option (see develop docs). It also adjusts our "Dealing with CORS Issues" page to include traceparent in the CORS configuration if users opted into the option.

IS YOUR CHANGE URGENT?

Help us prioritize incoming PRs by letting us know when the change needs to go live.

• Urgent deadline (GA date, etc.):
• Other deadline:
• None: Not urgent, can wait up to 1 week+

SLA

• Teamwork makes the dream work, so please add a reviewer to your PRs.
• Please give the docs team up to 1 week to review your PR unless you've added an urgent due date to it.
  Thanks in advance for your help!

PRE-MERGE CHECKLIST

Make sure you've checked the following before merging your changes:

• Checked Vercel preview for correctness, including links
• PR was reviewed and approved by any necessary SMEs (subject matter experts)
• PR was reviewed and approved by a member of the Sentry docs team

LEGAL BOILERPLATE

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

EXTRA RESOURCES

• Sentry Docs contributor guide

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Preview	Comments	Updated (UTC)
sentry-docs	Ready	Preview	Comment	Sep 4, 2025 11:01am

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
develop-docs	Ignored	Preview		Sep 4, 2025 11:01am

[codecov]

Bundle Report

Changes will increase total bundle size by 570 bytes (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-client-array-push	9.91MB	-6 bytes (-0.0%) ⬇️
sentry-docs-server-cjs	12.58MB	576 bytes (0.0%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: sentry-docs-server-cjs

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
1729.js	-3 bytes	1.78MB	-0.0%
../instrumentation.js	-3 bytes	1.1MB	-0.0%
9523.js	-3 bytes	1.08MB	-0.0%
../app/[[...path]]/page.js.nft.json	195 bytes	795.8kB	0.02%
../app/platform-redirect/page.js.nft.json	195 bytes	795.72kB	0.02%
../app/sitemap.xml/route.js.nft.json	195 bytes	793.19kB	0.02%

view changes for bundle: sentry-docs-client-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
static/chunks/pages/_app-*.js	-3 bytes	882.71kB	-0.0%
static/chunks/8321-*.js	-3 bytes	425.87kB	-0.0%
static/sXwO_39GYeNLbupOQvoUr/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/sXwO_39GYeNLbupOQvoUr/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/R7MbnyTJjzqklhQ2bldzy/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/R7MbnyTJjzqklhQ2bldzy/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️