Notes - Manifest Working Session (EU/US) (Apr 9, 2026)

[Dan Murphy]

Notes 

pull requests!

• Approved & merged Add `color_scheme_dark` member and themeable members (colors only) by christianliebel · Pull Request #1207 · w3c/manifest

• Add `color_scheme_dark` member and themeable members

• Themeable member are currently only colors (are are parsed as such), and are explicitly just the background_color and theme_color members for now.

• Themeable members are defined in a way that allows them to be swapped in when the 'apply a manifest' process is used, helping reduce re-definitions of the member description.

• WebKit implementation bug: https://bugs.webkit.org/show_bug.cgi?id=311727

• Chromium implementation bug: https://crbug.com/383165202

• Bring back `beforeinstallprompt` by christianliebel · Pull Request #1206 · w3c/manifest

• waiting until we know more about positions

• Add `navigator.install()` by christianliebel · Pull Request #1175 · w3c/manifest

• waiting until we know more about positions

• Clarify how manifest image resources are fetched by marcoscaceres · Pull Request #1171 · w3c/manifest

• pinged marcos - this seems strictly better even though we technically don't have a 'context' for the image fetching algorithm

• Clarify applying manifest to an existing browsing context by christianliebel · Pull Request #1202 · w3c/manifest

• LGTM - squashed and merged.

issues!

• Clarify how images are loaded, and that they don't depend on CSP · Issue #910 · w3c/manifest

• solved via' Marcos's pull request, pending on him squashing & merging

• "Default display mode" section is super confusing · Issue #1024 · w3c/manifest

• left explicit feedback about how to update the spec with the extra concepts of requested vs effective

• Way to detect if a web app is installed · Issue #1092 · w3c/manifest

• Forked browser-tab usecase to Installation detection from a web app url opened in a browser tab · Issue #1214 · w3c/manifest

• Added this to CR, but needs confirming with WebKit for implementation intent / use case intent.

• Might require a standards position request

• Queried Marcos asking if we are in agreement on media query. Also asked about navigator.installed.

Action items

•