The data attribute is a well defined attribute in the HTML5 specification.

It would be nice to have a 'shortcut' in SeleniumLibrary, so we could use it as a locator.

For an Example:
If we had an element such as: <div data-automation="helptext">ABC 123</div>
Instead of using something like: css:div[data-automation="helptext"]
or instead of: //*[@data-automation="helptext"]

We could do something like this instead: data:automation:helptext

Submitted as per discussion in the seleniumlibrary channel in the RobotFramework Slack workspace.