Error Html 5 Playground

Question

Why i get this error ?
uncaught Typeerror:cannot convert undefined or null to object
line:3
https://code.sololearn.com/WVzqKeZ8RQbs

but working well on desktop browser
..
Ps:Please tell me if i miss some html 5 code.Thanks

Answer 1

Yes, <iframe> is the cause of the console error log... in code playground on app ( at least android ), but works right in code playground on web site: the app use probably the default 'web view' provided by the android api to display html, and the render engine may differ a few from implementations in web browsers ^^

Anyway, it's also true that your code have some invalid code ;)
As example, you have many typo mistakes ( probably copy-pasted ) where you write '<br/r>' instead of '<br>' ( yes, without the slash '/', because it's invalid even if tolerated :P )...

Answer 2

thanks for the correction friend