# Official production references
Verified 29 October 2026. These sources support technical guidance only, not affiliation.

[S1] YouTube channel branding: https://support.google.com/youtube/answer/10456525?hl=en
[S2] LinkedIn profile cover: https://www.linkedin.com/help/linkedin/answer/a568217
[S3] LinkedIn Page images: https://www.linkedin.com/help/linkedin/answer/a563309
[S4] X profile and header: https://help.x.com/en/managing-your-account/how-to-customize-your-profile
[S5] WCAG 2.2 contrast: https://www.w3.org/WAI/WCAG22/Understanding/contrast-minimum.html
[S6] Inter font and license access: https://rsms.me/inter/

Other dimensions are editable working canvases, not claimed universal platform requirements. Review the current upload preview before publishing. No font files are bundled.