0a86ccc8
 Luigi Serra
graph and datalet...
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# Polymer Elements
## Guide for Contributors
Polymer Elements are built in the open, and the Polymer authors eagerly encourage any and all forms of community contribution. When contributing, please follow these guidelines:
### Filing Issues
**If you are filing an issue to request a feature**, please provide a clear description of the feature. It can be helpful to describe answers to the following questions:
1. **Who will use the feature?** _“As someone filling out a form…”_
2. **When will they use the feature?** _“When I enter an invalid value…”_
3. **What is the user’s goal?** _“I want to be visually notified that the value needs to be corrected…”_
**If you are filing an issue to report a bug**, please provide:
1. **A clear description of the bug and related expectations.** Consider using the following example template for reporting a bug:
```markdown
The `paper-foo` element causes the page to turn pink when clicked.
## Expected outcome
The page stays the same color.
## Actual outcome
The page turns pink.
## Steps to reproduce
1. Put a `paper-foo` element in the page.
2. Open the page in a web browser.
3. Click the `paper-foo` element.
```
2. **A reduced test case that demonstrates the problem.** If possible, please include the test case as a JSBin. Start with this template to easily import and use relevant Polymer Elements: [http://jsbin.com/cagaye](http://jsbin.com/cagaye/edit?html,output).
3. **A list of browsers where the problem occurs.** This can be skipped if the problem is the same across all browsers.
### Submitting Pull Requests
**Before creating a pull request**, please ensure that an issue exists for the corresponding change in the pull request that you intend to make. **If an issue does not exist, please create one per the guidelines above**. The goal is to discuss the design and necessity of the proposed change with Polymer authors and community before diving into a pull request.
When submitting pull requests, please provide:
1. **A reference to the corresponding issue** or issues that will be closed by the pull request. Please refer to these issues using the following syntax:
```markdown
(For a single issue)
Fixes #20
(For multiple issues)
Fixes #32, #40
```
2. **A succinct description of the design** used to fix any related issues. For example:
```markdown
This fixes #20 by removing styles that leaked which would cause the page to turn pink whenever `paper-foo` is clicked.
```
3. **At least one test for each bug fixed or feature added** as part of the pull request. Pull requests that fix bugs or add features without accompanying tests will not be considered.
If a proposed change contains multiple commits, please [squash commits](https://www.google.com/url?q=http://blog.steveklabnik.com/posts/2012-11-08-how-to-squash-commits-in-a-github-pull-request) to as few as is necessary to succinctly express the change. A Polymer author can help you squash commits, so don’t be afraid to ask us if you need help with that!
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