hx-vars has been deprecated in favor of
hx-vals, which is safer by default.
hx-vars attribute allows you to dynamically add to the parameters that will be submitted with an AJAX request.
The value of this attribute is a comma separated list of
<expression> values, the same as the internal
<div hx-get="/example" hx-vars="myVar:computeMyVar()">Get Some HTML, Including A Dynamic Value in the Request</div>
hx-vars is inherited and can be placed on a parent element.