Strikethrough statement when checkbox is selected?

Hi there,
yes, this is doable.

1. add the class .lineThrough{text-decoration:line-through;} in the look and feel section ->style -> custom css


2. add the below javascript to the respective question

Qualtrics.SurveyEngine.addOnload(function()
{
this.questionclick = function(event,element)
    {
       
        if (element.type == 'checkbox')
        {
            let choiceId = element.id;
console.log(choiceId)
let selectedChoiceId  =  choiceId.split('~')[2]
let lw = document.getElementById(this.questionId+'-'+selectedChoiceId+'-label') //get the label element
let ls = lw.getElementsByTagName('span') // get the span element where the label text is
console.log(ls)

if(element.checked == true){
ls[0].addClassName('lineThrough') //if choice is selected add class

}else{

ls[0].removeClassName('lineThrough') //if choice is deselected remove class
}
           
            
        }
    }
});

Please note that this will work with the flat layout
Best regards

Rudi