The HTMLFormElement.acceptCharset property represents a list of the supported character encodings for the given FORM element. This list can be comma- or space-separated.
string = form.acceptCharset; form.acceptCharset = string;
inputs = document.forms["myform"].acceptCharset
HTML 5, Section 4.10.3: The Form Element
DOM Level 2 HTML: acceptCharset
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/acceptCharset