External links

To mark a link as external, add class="external" to the <a> element when authoring in HTML or append {: .external} to links when authoring in Markdown.

For example:

Check out the GoogleCloudPlatform repo on GitHub for code samples.

HTML

<p>Check out the
<a href="https://www.github.com/GoogleCloudPlatform" class="external">
GoogleCloudPlatform</a> repo on GitHub for code samples.</p>

Markdown

Check out the
[GoogleCloudPlatform](https://www.github.com/GoogleCloudPlatform){: .external} 
repo on GitHub for code samples.

Refer to the Google developer documentation style guide for guidance on when to use external links.