wc3 validation

Hi, wc3 validation says that the buttons need an alt image. can you trell how to do it please?

Line 630, Column 167: required attribute “alt” not specified
…ficial Big Balloon (icon+text)/1.png”/><img style=”display:none” src=”https://l…
?
The attribute given above is required for an element that you’ve used, but you have omitted it. For instance, in most HTML and XHTML document types the “type” attribute is required on the “script” element and the “alt” attribute is required for the “img” element.

Typical values for type are type=”text/css” for <style> and type=”text/javascript” for <script>.

<div style=”display:none”><img style=”display:none” src=”https://lnodenison.com/wp-content/plugins/neat-skype-status-pro/ICONS/Official Big Balloon (icon+text)/1.png”/><img style=”display:none” src=”https://lnodenison.com/wp-content/plugins/neat-skype-status-pro/ICONS/Official Big Balloon (icon+text)/2.png”/><img style=”display:none” src=”https://lnodenison.com/wp-content/plugins/neat-skype-status-pro/ICONS/Official Big Balloon (icon+text)/3.png”/><img style=”display:none” src=”https://lnodenison.com/wp-content/plugins/neat-skype-status-pro/ICONS/Official Big Balloon (icon+text)/5.png”/></div> <div style=”display:none”>

Steve

https://www.ads-software.com/extend/plugins/neat-skype-status/