Issue #3285✓ SolvedOpened February 21, 2021by ashercoren6 reactions

Doctype in the canvas iframe

Quick answerby artf5

In the next release, I'll add a new event helper that will allow editing iframe content before load:

Read full answer below ↓

Question

Hi. This question has already been asked twice (here and here) but has never got an answer.

Is there a way to add <!DOCTYPE html> as the beginning of the canvas iframe so that the iframe will be in standards mode.

I need this since I am trying to use tinyMce as the custom RTE, and tinyMce requires standards mode.

Answers (4)

👍 Most helpfulartfJune 22, 2021

In the next release, I'll add a new event helper that will allow editing iframe content before load:

editor.on('frame:load:before', ({ el }) => {
  const doc = el.contentDocument;
  doc.open();
  doc.write("<!DOCTYPE html>");
  doc.close();
});
bgrand-chMay 11, 2021

Hello, For future questions or technical issues, which aren't bugs, GitHub's Discussions tab is the place to be. Don't forget to close this issue if it is resolved or write a new detailed message in Discussions -> Q&A category (and close this issue). Thank you for your understanding.

artfMarch 3, 2021

Not really, but I'm open to solutions on how to make it customizable.

GJSBlockMay 17, 2026

Thanks for reporting this, @ashercoren. Great question about [Question]: Doctype in the canvas iframe. The recommended approach with ProseMirror is to use the event-driven API. Start here: Check the GrapesJS documentation for your specific module Look for the on() event listener method Most operati...

Related Questions and Answers

Continue research with similar issue discussions.

Paid Plugins That Match This Issue

Curated by issue keywords and label relevance to help you ship faster.

View all plugins

Loading paid plugin recommendations...

Free option

Check the open-source GrapesJS plugins on GitHub or run a quick search in our free catalog.

Browse free plugins →
Premium option

Premium plugins ship with support, regular updates, and production-ready features — save days of integration work.

Browse premium plugins →

Related tutorials

In-depth guides on the same topic.

All tutorials →

Browse Plugin Categories

Jump directly to plugin category pages on the marketplace.