On CurseForge, if the addon is "popular", html markup for a gif is shown in the title of addons in the matching process (see [1]).
On WoWInterface there's a similar issue with html markup for recently updated addons (see [2])
1:
Found 11 matches for WeakAuras 2 by Mirrored and the WeakAuras Team
1. Death knight Presence WeakAuras2 UI <img src="//cdn-wow.mmoui.com/images/style_mmoi_wowi2/downloads/popular.gif" border=0 alt="Popular! (More than 5000 hits)"> (by magicaldandruff, updated 05/05/15 on WowAce)
2:
Found 2 matches for World Quest Tracker by <unknown>
1. World Quest Tracker 8.0 <img src="//cdn-wow.mmoui.com/images/style_mmoi_wowi2/downloads/updated_3.gif" border=0 alt="Updated less than 3 days ago!" /> <img src="//cdn-wow.mmoui.com/images/style_mmoi_wowi2/downloads/popular.gif" border=0 alt="Popular! (More than 5000 hits)"> (by Tercioo, updated 01/07/18 on WowAce)
On CurseForge, if the addon is "popular", html markup for a gif is shown in the title of addons in the matching process (see [1]). On WoWInterface there's a similar issue with html markup for recently updated addons (see [2])
1:
2: