The root cause is that resizedUserAvatar (macros.vm) sets both alt and title to the exact same user-name string on the avatar <img>, and Chromium-based browsers expose title as an extra spoken accessibility property distinct from the alt-derived name — so screen readers driven by Chrome/Edge announce the name twice. Firefox doesn't double-expose it that way (its related, but distinct, defect is a separate ticket, XWIKI‑23714).
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