Code sandbox liquid tag w/ focus input causes scrolling on page load

[jessleenyc]

Describe the bug
Reported by a user trying to embed a codesandbox that focuses an input. The page 'jumps'/scrolls to the embed when it loads.

To Reproduce
Create a new post w/ this liquid tag: {% codesandbox pyqq0o9mk7 %}. Make sure it appears below the fold so you can see the jump.

Expected behavior
Liquid Tag shouldn't cause scrolling on page load.

[benhalpern]

Is there anything we can do with iframe attributes to turn this off?

[mariocsee]

In the CodeSandbox documentation, there's an option runonclick that the user will have to add to prevent the jump (by not loading the codesandbox until the article reader decides to).

The codesandbox liquid tag doesn't support runonclick, but extending the regex query to accept runonclick in the valid_option method in codesandbox_tag.rb should do the trick. How does this workaround sound?

[maestromac]

Resolved with #2381