The HTML content to be copied.
The options object.
If true, the plain text will be the same as the HTML. If false, the plain text will be the same as the HTML, without the HTML tags.
If true, the plain text will be markdown. If false, the plain text will be the same as the HTML, without the HTML tags.
Copy HTML to clipboard. When pasting into rich text field, pastes rich text. When pasting into plain text field, pastes: plain text, html, or markdown.