Styling radio buttons with CSS outside of a <form> tag

Seeking advice on an issue I encountered while trying to add custom CSS to a tool that auto-generates HTML content for me. The problem arises from the fact that the tool places radio buttons (<input type="radio") outside of the <form> element, as highlighted in a response to another query on StackOverflow. This presents challenges because without the <form> element, the CSS code snippet below cannot be implemented:

input[type="radio"]:checked+label {
  background: yellow;
}

An example snippet of the code is provided below:

input[type="radio"]:checked+label {
  background: yellow;
}
<div class="apt-survey-multi-choice-radio-answers">
  <label class="apt-survey-multi-choice-radio">
    <input type="radio" value="d45ec94d-88cb-43bc-b4c9" placeholder="" class="" name="apt-trigger-radio-8c027e80-2df7-494a-a3a5" tabindex="31767">
    <div class="apt-survey-multi-choice-radio-label">
      <div class="multi-survey-answer">
        <meta charset="utf-8">
        <style type="text/css">
          <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}
          -->
        </style>
        <span data-sheets-userformat="{&quot;2&quot;:515,&quot;3&quot;:{&quot;1&quot;:0},&quot;4&quot;:{&quot;1&quot;:2,&quot;2&quot;:14281427},&quot;12&quot;:0}" data-sheets-value="{&quot;1&quot;:2,&quot;2&quot;:&quot;Marketing - Individual Contributor&quot;}" style="font-size:10pt;font-family:Arial;font-style:normal;">
          <meta charset="utf-8">
          <style type="text/css">
            <!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}
            -->
          </style>
          <span data-sheets-userformat="{&quot;2&quot;:515,&quot;3&quot;:{&quot;1&quot;:0},&quot;4&&qu...

Looking for a workaround to this situation since modifying the software to include the missing <form> element is not feasible in the near future. Any suggestions on applying CSS styling to radio buttons outside of a <form>? Remember, restrictions apply and only CSS can be utilized, no JavaScript or HTML modifications.

Answer №1

The selector code

input[type="radio"]:checked + label
is searching for a label that is an immediate sibling of a checked radio input, but your HTML structure looks like this:

<label class="apt-survey-multi-choice-radio">
    <input type="radio" ...>
    ...
</label>

You should target a label that contains a checked radio input, which can be achieved using the :has() selector.

label:has([type="radio"]:checked) {
   background: yellow;
}
<label>
    <input type="radio" />
    Label
</label>

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