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Is

Check the current matched set of elements against a selector and return true if at least one of these elements matches the selector.

<div>
  <div class="testIs" style="cursor:pointer">Click me</div>
  <span class="testIs" style="cursor:pointer">Click me</span>
  <br>
  <input class="testIs" type="button" id="btnRunHas" value="Click me" />
<?php
echo
YsJQuery::newInstance()
  ->onClick()
  ->in('.testIs')
  ->execute(
      sprintf(
      'if(%s){
        alert("Yes, I am a button")
      }else{
        alert("No, I am not a button")
      }',YsJQuery::is('input:button')->in('this'))
  )
?>

</div>