How to export source content within div to text/html file

Question

Let\'s say I have

... Some html ...

and I need to take the html code within this div, place it inside a file and for

Answer 1

Update for Zagen function. Original will not work in IE 10-11:

function downloadInnerHtml(filename, elId, mimeType) {
    var elHtml = document.getElementById(elId).innerHTML;
    if (navigator.msSaveBlob) { // IE 10+ 
        navigator.msSaveBlob(new Blob([elHtml], { type: mimeType + ';charset=utf-8;' }), filename);
    } else {
        var link = document.createElement('a');
        mimeType = mimeType || 'text/plain';

        link.setAttribute('download', filename);
        link.setAttribute('href', 'data:' + mimeType  +  ';charset=utf-8,' + encodeURIComponent(elHtml));
        link.click(); 
    }
}