JSFiddle - React, Tailwind, and code Playground
HTML
<input type="button" name="foo" value="un" class="preview" />
<input type="button" name="foo" value="deux" />
<input type="button" name="foo" value="trois" class="preview" />
<input id="bar" type="button" value="go" />
CSS
.preview {display:none;}
JavaScript
$('#bar').click( function(){
$('[name="foo"].preview').fadeIn(4000, function(){alert('finished') })
})