This script is separate from the Lurch app and is not imported anywhere in the Lurch app's code. It is intended to be used in pages that want to embed within themselves small copies of the Lurch app, for example, to show small proofs or other small documents, such as in Lurch's documentation or in mathematical lessons on proofs. Its source can be found here.

The intent of this script is that any page on the web can import this script and it will find all elements in the page of the form <div class='lurch-embed'>...</div> and will transform each into an iframe containing the Lurch app, then pass the HTML form of the div to that app as a string using postMessage(). The app is then free to load the content of the div, as a document, and respect any attributes the user has attached to that div, as part of that process.

That DIV may have any of the following attributes.

• appURL - the URL of the Lurch app to use. If not provided, this defaults to the copy of the app hosted on the Lurch website, lurchmath.github.io/lurch/app.
• validate - if set to true, the embedded copy of the Lurch app will not only load the document defined inside the DIV tag, but will then also run validation on it
• Any other attributes specified will be copied to the iframe that replaces the DIV and is used to load the Lurch app. For example, you may want to specify height, width, border style, etc.

To see how you can format the contents of the DIV so that they will be understood by the embedded app, see the EmbedListener module.