Fill in the signup
It posts to a new tab, so your visitor keeps their place on the page.
Feature
Paste a service’s embed code, such as a Google Form or a newsletter signup, and it runs inside an isolated frame. It works for any editor because the code cannot read or change the rest of the page.
It posts to a new tab, so your visitor keeps their place on the page.
The small script draws a random book quote. It runs inside the frame and nowhere else.
The signup and the quote grow to fit what is inside. The form is a fixed height, because Google Forms cannot report one.
Paste the <iframe> from Send, then Embed. Pick a fixed height for Google Forms. This one points at a placeholder form, so Google shows its “not found” page until you paste your own.
A form with its own style, as a mailing service gives it. The frame grows to fit it, and the form opens its answer in a new tab.
A few lines of script that draw a book quote. Scripts run here, but they cannot reach the page around them.