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              ### Interaction

    <a href="*">
      <input type="button" value="Trust GILS on testnet">

### Description

This pen shows how to pass a trustline opening request from a simple HTML button. It uses the CosmicLink protocol.

### Concepts

- [Trustline]( A declaration that you accept to hold a given asset.
- [CosmicLink]( A protocol to encode Stellar transactions into URIs.

### Keypoints

- GILS is an asset issued by to reward people who solve Pen of the Week challenges. [Read more...](
- By looking at the code, you should be able to make sense of the link in the `href` attribute.
- The part starting from the `?` is the transaction request.
- The part before the `?` is the handler address.
- Other handlers are available, such as `` or the CosmicLink debugger linked bellow.

### Challenges

- **easy/** Edit the code to create a `[Trust GILS on public]` button.
- **hard/** Edit the code to create a `[Close GILS trustline]` button that passes its request to the CosmicLink debugger.

_Give it a try by editing the code, and be the first to post a solution on GalacticTalk!_

### Documentation

- [CosmicLink Cheatsheet](
- [CosmicLink Debugger](

### Social

- [Discuss that pen on GalacticTalk](