svg-template-support.js

// Templates inside SVG won't work in polymer-1.0 without some monkeypatching.
(function() {
    var templates = document.currentScript.parentElement.querySelector("template").content.querySelectorAll("svg template");
    Array.prototype.slice.call(templates).reverse().forEach(function(template) {
        var new_template = template.ownerDocument.createElement("template");
        template.parentElement.replaceChild(new_template, template);
        Array.prototype.forEach.call(template.attributes, function(attribute) {
            new_template.setAttribute(attribute.name, attribute.value);
        });
        for (var child; child = template.firstChild; new_template.content.appendChild(child));
    });
})();

querySelector("svg template") elements should be processed descendants first (in reverse order) for nested <template>