moodle/lib/form/templates/element-submit.mustache

{{< core_form/element-template }}
    {{$element}}
        {{^element.frozen}}
            <input type="submit"
                class="btn
                    {{^element.customclassoverride}}
                        {{^element.secondary}}btn-primary{{/element.secondary}}
                        {{#element.secondary}}btn-secondary{{/element.secondary}}
                    {{/element.customclassoverride}}
                    {{#error}} btn-danger {{/error}}
                    {{element.extraclasses}}
                    {{#element.customclassoverride}}{{element.customclassoverride}}{{/element.customclassoverride}}"
                name="{{element.name}}"
                id="{{element.id}}"
                {{#error}}
                    autofocus aria-describedby="{{element.iderror}}"
                {{/error}}
                value="{{element.value}}"
                {{{element.attributes}}} >
        {{/element.frozen}}
    {{/element}}
{{/ core_form/element-template }}
{{# js }}
    {{^element.frozen}}
        require(['core_form/submit'], function(Submit) {
            Submit.init("{{ element.id }}");
        });
    {{/element.frozen}}
{{/ js }}