Csswg-drafts: [css-display-3] Clarify the term "contiguous sequence of sibling text nodes"

[SelenIT]

In the introduction section of [css-display-3], the "text run" concept is introduced in the following paragraph:

...each _contiguous sequence of sibling text nodes_ generates a _text run_ containing their text contents, which is assigned the same styles as the generating text nodes.

As far as I understand, several contiguous sibling text nodes in the same element can occur only as a result of DOM operations like appendChild(). But what about sibling text nodes separated only by the HTML comment node? Technically, they hardly can be called "a _contiguous_ sequence", but the intent of the "text run" concept seems to suggest that they should form a single text run rather than two separate ones. Doesn't this need clarifying?

[Loirooriol]

My understanding is that comment nodes exist in the DOM tree but not in the element tree.
The element tree only contains text nodes and elements (including pseudo-elements).
So in your example, the text nodes are actually contiguous.
But of course this needs to be properly defined, see #1810

[SelenIT]

My understanding was that the element tree is an abstraction and DOM is one its possible implementation (not the only, but the most practically common), so I didn't think of it as of some intermediate structure. This comment from @fantasai seems to support this understanding. So making this definition unambiguous would be really appreciated!

[tabatkins]

I think it's reasonable to clarify that nodes other than element or text are ignored for the purpose of this definition, yeah.