paper-progress-button:
[ This description is mirrored from README.md at github.com/Collaborne/paper-progress-button on 2019-05-10 ]
paper-progress-button 
A paper button gets disabled and shows a spinner while submitting
To install the element:
bower install paper-progress-button
<paper-progress-button
active="[[active]]"
active-text="Submit"
inactive-text="Submitting..."
raised>
</paper-progress-button>
<paper-checkbox checked="{{active}}">Active</paper-checkbox>
License
This software is licensed under the Apache 2 license, quoted below.
Copyright 2011-2015 Collaborne B.V. <http://github.com/Collaborne/>
Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy of
the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations under
the License.