include
includeHTML(path)
includeText(path)
includeMarkdown(path)
includeCSS(path, ...)
includeScript(path, ...)Arguments
| path | The path of the file to be included. It is highly recommended to use a relative path (the base path being the Shiny application directory), not an absolute path. | 
|---|---|
| ... | Any additional attributes to be applied to the generated tag. | 
Description
Load HTML, text, or rendered Markdown from a file and turn into HTML.
Details
These functions provide a convenient way to include an extensive amount of HTML, textual, Markdown, CSS, or JavaScript content, rather than using a large literal R string.
Note
includeText escapes its contents, but does no other processing.
  This means that hard breaks and multiple spaces will be rendered as they
  usually are in HTML: as a single space character. If you are looking for
  preformatted text, wrap the call with pre, or consider using
  includeMarkdown instead.
The includeMarkdown function requires the markdown
  package.