Ticking “Show comments cookies opt-in checkbox.” at Settings > Discussion in WordPress will show a “Save my name, email, and website in this browser for the next time I comment.” checkbox in the comment forms.

If you want to make this checkbox mandatory before the comment can be submitted for GDPR or any other reason, follow this tutorial.

Step 1

Load the following jQuery on the template that gets applied to all the single posts:

(function($) {
    $('#wp-comment-cookies-consent').change(function () {
        $('#commentform #submit').prop("disabled", !this.checked);
    }).change()
})(jQuery);

where #wp-comment-cookies-consent is the ID of the checkbox and #commentform #submit is the selector for the comment form submit button.

If you are using Oxygen, edit the Blog Post Template, add a Code Block and paste it in the JavaScript section.

Step 2

Let’s add some CSS to give the disabled appearance to the submit button when it has the disabled attribute in the HTML.

#commentform #submit[disabled] {
    background-color: #ddd;
}

Note for Oxygen users:

You will need to also add the following for the comment form labels including the checkbox text to appear:

.oxy-comment-form label {
    display: block;
}

.comment-form-cookies-consent {
    display: flex;
}

#wp-comment-cookies-consent {
    width: auto;
    margin-right: 10px;
}

.oxy-comment-form .comment-form-cookies-consent label {
    line-height: 1.1;
    font-weight: normal;
}

References:

https://wpdevdesign.com/how-to-customize-the-comment-form-in-oxygen/

https://stackoverflow.com/a/28428821/778809

https://www.w3schools.com/css/css_attribute_selectors.asp

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