Bug 44: Split Button — Dropdown Arrow
WCAG 1.1.1 (Text Alternatives), 4.1.2 (Name, Role, Value) | Dropdown arrow button without accessible name.
Bug: Arrow Button No aria-label
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Bug: Dropdown State Not Announced
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Bug: Main Button Action Unclear
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How HAL Fixes This: HAL detects split buttons and adds aria-label to the dropdown arrow (e.g., "Download options" or "More actions"). It also adds aria-expanded="true/false" to indicate menu state and aria-haspopup="menu" to indicate a menu will open.