Add terms of service element

Task

• Create element
• Create webform element
• Add test form
• Generate examples
• Add to style guide
• Add previews

Element properties

• #terms_display modal|slideout
• #terms_title
• #terms_content

Notes

• Type: webform_terms_of_service
• Extends checkbox.
• #title must be customizable
• Defaults to I agree to the terms of service.
• Terms will always be appended as hidden container to checkbox.

References

• https://www.google.com/amp/s/termsfeed.com/blog/examples-i-agree-to/amp/
• http://formvalidation.io/examples/terms-conditions-agreement-validation/