Which code printed this error to the console "element _: validity error : ID _ already defined"

[chengguangnan]

I try to find a way to silent those messages but could not locate the code in loofah or nokogiri.

Any idea where does it come from? libxml?

> Loofah.document("<i id=a></i><i id=a></i>").to_text
element i: validity error : ID a already defined

[chengguangnan]

I found it related by the #dup method here.

https://github.com/flavorjones/loofah/blob/master/lib/loofah/instance_methods.rb#L116

self.dup.scrub!(:newline_block_elements).text(options)

Demo:

irb(main):032:0> d.text
=> ""
irb(main):033:0> d.dup.text
element i: validity error : ID a already defined
=> ""

[chengguangnan]

I can confirm the same behavior on Nokogiri.

Nokogiri::HTML("<i id=a></i><i id=a></i>").dup.text
element i: validity error : ID a already defined
=> ""

[flavorjones]

Closing, as you've opened a Nokogiri bug to track this issue.

[flavorjones]

This will be fixed in Nokogiri 1.6.5, out soon.