Be careful with addons! If you do not want a space between the addon and the input make sure that there is no space between the </span> and <input> tags. Example:
Although over 75% of Android devices we tested support all "Total Set" icons, if a substantial portion of your users use old Android devices you should stick to the "Android Safe" set. (The "Total Set" does not include icons from the "Android Safe" set.)
<i class="ico">Copy and paste icons from above here!</i>