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Finally, we display the selected images when the checkboxes and radio buttons are selected: CSS CSS Reference CSS Browser Support CSS Selector Reference Bootstrap 3 Reference Bootstrap 4 Reference W3.CSS Reference Icon Reference Sass Reference. JavaScript Alert the label value of the selected option in a drop-down list: var x = document.getElementById("mySelect").selectedIndex; Input and Select. I handle this by having my startup JS give input and select elements having attribute data-value an “onchange” handler (or “change” event listener) that does this.dataset.value=this.value (remember to use .bind(elm) or a factory function). Although this solution is not pure CSS, it’s a mere whiff of boilerplate JS code to let CSS handle dependent display elements But all other inputs, including