HTML5 is entirely better than Flash for creating drop-down menus, and it is the only viable option today.
Adobe officially discontinued Flash Player, and modern web browsers completely blocked Flash content. If you build a navigation menu using Flash, your users will see a broken or blank box instead of a menu.
The direct comparison below shows why HTML5 (combined with CSS and JavaScript) completely replaced Flash. Quick Comparison Developer announcement: Flash vs. HTML5 – Please read this
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