I created a demonstration of how you can seamlessly incorporate this feature into your website
The special keyword to display the emoticon is: [bgflag]
Using the flag provided in your post, I designed this emoticon with a size of 16x16px
Responding to feedback from @Niet the Dark Absol regarding replacing information site-wide, I have made an adjustment to the code. The replacement will now only affect content within the DIV element id="comments"
var emoji = '<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAyhpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77...'>
<div id="comments">
Lorem ipsum dolor [bgflag] sit amet consectetur adipisicing elit. Quod, fuga totam! Ipsum nihil possimus quidem
voluptates illo porro consequuntur libero quisquam dolor aliquid! Neque commodi [bgflag] ipsa vel beatae,
incidunt
minus?
</div>