Please refer my website:

http://opengrok.club/topic/21/%E4%BB%A3%E7%A0%81%E6%B5%8F%E8%A7%88%E5%8A%9F%E8%83%BD%E4%BB%8B%E7%BB%8D-features-of-source-code-viewer/6

Especially in my iPhone, when I scroll up, the image of replies from 1-5 can not be shown sometimes, around 80% times.
I had a short analyze about this, found the hidden image tag data-state always stays 'loading'.
In my laptop, around 20% times it will not be shown.
Is is caused by network condition? or it's a bug in image.js?