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[css-display-3] Specify who establishes initial formatting context #6708

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rosshjb opened this issue Oct 2, 2021 · 5 comments
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[css-display-3] Specify who establishes initial formatting context #6708

rosshjb opened this issue Oct 2, 2021 · 5 comments
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Closed as Duplicate css-display-3 Current Work

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@rosshjb
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rosshjb commented Oct 2, 2021

According to https://www.w3.org/TR/css-display-3/#block-container:

A block container either contains only inline-level boxes participating in an inline formatting context, or contains only block-level boxes participating in a block formatting context

When we have only divs in body element, does who establishes initial block/inline formatting context? In this case, i didn't apply any properties like display: flow-root explicitly:

<body>
  <div>1</div>
  <div>2</div>
</body>

Certainly, because the body only contains block-level elements, these two divs participate in block formatting context, and thus we can say that the body is block container, at least.

But the condition which in BFCs are established is as follows( from https://www.w3.org/TR/2011/REC-CSS2-20110607/visuren.html#block-formatting ):

Floats, absolutely positioned elements, block containers (such as inline-blocks, table-cells, and table-captions) that are not block boxes, and block boxes with 'overflow' other than 'visible' (except when that value has been propagated to the viewport) establish new block formatting contexts for their contents.

The example i posted above doesn't satisfy any these cases. So, i think that the spec should contain who establish initial formatting context.
@Loirooriol
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Yes, that <body> is a block container, and is a block box. But it doesn't establish a BFC, it just continues the BFC established by the <html>. The <html> mush establish its own BFC because there is no parent BFC.

@rosshjb
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rosshjb commented Oct 7, 2021

@Loirooriol How do we know that the html establish a BFC, from specification? I could find the closest thing to the fact only in the following:

A block container establishes a new block formatting context if its parent formatting context is not a block formatting context[...] — https://www.w3.org/TR/css-display-3/#block-container

But, can we say that establishes a new block formatting context if its parent formatting context is not a block formatting context equals to establishs its own BFC because there is no parent BFC.? In other worlds, "a parent is not BFC" -> "there is no parent"?

It may not matter who establishes the initial FC but i think it's better to specify this concern explicitly.

@Loirooriol
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Yes, it could be more clear. I guess this is basically a duplicate of #6480

@rosshjb
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rosshjb commented Oct 7, 2021

@Loirooriol So, closing this?

@Loirooriol
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Duplicate of #6480

@Loirooriol Loirooriol marked this as a duplicate of #6480 Oct 7, 2021
@rosshjb rosshjb mentioned this issue Oct 7, 2021
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@Loirooriol @rosshjb