jQuery addClass to all Elements with Class

$('.specialprice.priceis').addClass('strike'); ?

Your HTML is wrong

<span id="priceis">

You probably meant to set class instead of id.

<span class="priceis">

Your current code will work if you fix your HTML.

You might want to see this answer, it explains why a script doesn't work when included before the DOM elements.

maybe something like this? still not sure about the explanation of your question, not clear..

$(function() {
  $('.specialprice').each(function() {
    $(this).find('.priceis').addClass('strike');
  });
}

EDIT: just realized maybe you wanted it like this?

$('.specialprice').each(function() {
  $(this).find('*').addClass('strike');
});

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