Help me understand this error

[rajana...@gmail.com]

Hello All,

Can someone please explain why the following error occurs and what it means? 

Uncaught HierarchyRequestError: Failed to execute 'appendChild' on 'Node': Nodes of type 'HTML' may not be inserted inside nodes of type '#document'

I am not sure I am able to reproduce it but it occurs from time to time, usually when I import more than one custom element. It's extremely hard giving exact context since I am working on integrating polymer's paper/core elements for our in-house widgets. Broadly speaking what are the cases that I would see this error? Any kind of help is appreciated. Thank you.

Regards,

Raja

[Eric Bidelman]

http://stackoverflow.com/questions/26766181/please-help-me-understand-this-error

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[gree...@gmail.com]

Hi,

I've seen exactly this error when multiple instances of TemplateBinding.js were included in the page. The error happened at this line:

https://github.com/Polymer/TemplateBinding/blob/master/src/TemplateBinding.js#L163:

var html = d.appendChild(d.createElement('html'));

it's the attempt to insert second html element that failed.

Not sure if the same thing is happening in your case, but I got it when I had custom element with bower.json that referenced polymer-dev repo instead of polymer (back when -dev repos were still in use, and I wanted to pull in non-minified code for some debugging).

My component pulled in polymer-dev, other dependencies pulled in polymer, that's how I ended up with two copies of polymer scripts.

Hope this helps,

Artem

[rajana...@gmail.com]

Hey,

It's the same error for the same line but in a different file, the full error with the file name is below 

Uncaught HierarchyRequestError: Failed to execute 'appendChild' on 'Node': Nodes of type 'HTML' may not be inserted inside nodes of type '#document'.  polymer.concat.js:6290

I have more details in the comments in here http://stackoverflow.com/questions/26766181/please-help-me-understand-this-error

Raja

[Rob Dodson]

Just curious: are you using the yeoman generator to build your project?

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[raja naresh]

Nope, if I remember correctly I just bower installed all the core and paper elements but I have two different versions of it and my project used (imported) elements from both versions (not duplicates but different elements). The error resolved when I changed all the import paths to the same version of the core and paper elements. 

I took a detour from this after quick fixing but I should probably do what @artem suggested here http://stackoverflow.com/questions/26766181/please-help-me-understand-this-error. Any other ideas are welcome as well, I will eventually get back to this. Thank you very much. 

[Andrew Fallows]

I'm encountering this same issue after using vulcanize to build my component tree into a single file.

https://www.dropbox.com/s/p7owem5ya5ruu6b/Screenshot%202014-12-10%2016.35.59.png?dl=0

That error happens at the top, and then I get a lot of Uncaught TypeErrors (although I think these are a side effect of the first issue, because the first issue breaks the Polymer object).

[Rob Dodson]

Can you post your project to github so we can see how the source is arranged?

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[Andrew Fallows]

Unfortunately, I can't do that -- don't have permission to make my project public. I think I traced down the root of my issue, and it had to do with a tool in our build pipeline which was injecting opening and closing <html> and <body> tags into html partials (and all of our components were written as html partials).