To select the text inside a span element when it is clicked, you can use the select method of the Range object in JavaScript. Here is an example of how you can do this:
<span onclick="selectText()">Click to select this text</span>
<script>
function selectText() {
var span = document.querySelector('span');
var range = document.createRange();
range.selectNode(span);
window.getSelection().addRange(range);
}
</script>
This will cause the text inside the span to be selected when the span element is clicked.