Function getChildPosition

docs/app/js/sanddance-app.js:6739–6743

(element)

    if ((element === document.body || element === container) && activeElementInfo.childPositions.length) return activeElementInfo;
}
function getChildPosition(element) {
    let childPosition = 0;
    while(element = element.previousElementSibling)childPosition++;
    return childPosition;
}
function tagNamespace(tag) {
    //issue: this won't disambiguate certain tags which exist in both svg and html: <a>, <title> ...
    if (tag === "svg" || svgTagArray.indexOf(tag) >= 0 && !(htmlTagArray.indexOf(tag) >= 0)) return "http://www.w3.org/2000/svg";