Example : [ External links are visible to forum administrators only ]
included on the page with <img src=""> tag but not visible (i don't now)
"<img style="-webkit-user-select: none;background-position: 0px 0px, 10px 10px;background-size: 20px 20px;background-image:linear-gradient(45deg, #eee 25%, transparent 25%, transparent 75%, #eee 75%, #eee 100%),linear-gradient(45deg, #eee 25%, white 25%, white 75%, #eee 75%, #eee 100%);cursor: zoom-in;" src="[ External links are visible to forum administrators only ]" width="295" height="199">"