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- /** Marks the document root with the host platform so shared Web UI CSS can scope desktop-only rules. */
- /**
- * Sets `data-platform` (e.g. `darwin`) on `<html>`, deferring to DOMContentLoaded
- * when the preload runs before the document root exists.
- */
- export function markDocumentPlatform(): void {
- const mark = (): void => { document.documentElement.dataset.platform = process.platform }
- // lib.dom types documentElement non-null, but a preload runs before the
- // document root exists.
- const root = document.documentElement as HTMLElement | null
- if (root === null) window.addEventListener('DOMContentLoaded', mark)
- else mark()
- }
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