3

In Drupal 8 is it safe to manually add a class attribute to the HTML element in the theme's html.html.twig file?

<html{{ html_attributes }} class="no-js">

Its working fine for me but I don't know if there are some instances where Drupal would want to add a class as part of html_attributes? If so then presumably my output would be this:

<html class="drupals-class" class="no-js">
2

You should use .addclass():

<html{{ html_attributes.addClass('no-js') }}>

That would prevent the output in the example from your question and the result will be:

<html class="drupals-class no-js">
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