[css-box-model] Definition for collapsed margin has a little problem

[LasyIsLazy]

The CSS2.2 definition from here:

In CSS, the adjoining margins of two or more boxes (which might or might not be siblings) can combine to form a single margin. Margins that combine this way are said to collapse, and the resulting combined margin is called a collapsed margin.

Only two or more boxes can result to collapsed margin, but in fact, one box can also result to collapsed margin.

See here:

top and bottom margins of a box that does not establish a new block formatting context and that has zero computed 'min-height', zero or 'auto' computed 'height', and no in-flow children

I wonder if there is a problem in the description of 'two or more boxes'.

[Loirooriol]

The 2nd quote is not for collapsed margins, it's for adjoining margins.

[SelenIT]

Those adjoining margins can also be collapsed though. The last bullet point in the note following that paragraph (that clarifies the effects of margin collapsing rules) clearly says about collapsing a single box's own margins. So including the "collapsing through" case into the definition of margin collapsing makes sense to me.