What triggers the activation of the inline formatting context in this particular scenario?

MDN provides insight about the img element in regard to styling with CSS, highlighting how images interact within an inline formatting context.

The positioning of images when used in-line can be affected by vertical-align: baseline due to <img> not having a baseline.

Recently, I encountered an issue with an image that had a small gap below it. The code snippet is as follows:

p {
    border:  5px red solid;
    margin: 0;
 }
<img src="https://images.unsplash.com/photo-1661177405620-24e65f27ac0e?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1470&q=80" width="250px" />
 <p>This is a paragraph with a gap above it</p>

I am puzzled as to why my image has this gap despite being in a block formatting context defined by the <p> element, which is a block-level element.

How does the inline formatting context come into play here?

Normally, the gap would only appear if the image was placed in an inline formatting context, but based on my understanding, this shouldn't be the case with the current setup.

I may have misconstrued some aspects of this topic. Any clarification would be greatly appreciated. Thank you!

Answer №1

Within the anonymous block element, the img is placed, surrounded by an inline formatting context. For more details on this concept, you can refer to: https://www.w3.org/TR/CSS2/visuren.html#anonymous-block-level

The DIV seems to contain both inline and block content. To simplify defining the formatting, it's assumed that there exists an anonymous block box around "Some text".

Think of it like this scenario where the div acts as the anonymous block box creating an inline formatting context within:

p {
    border:  5px red solid;
    margin: 0;
 }
 
 div {
   outline: 1px solid green
 }
<div><img src="https://images.unsplash.com/photo-1661177405620-24e65f27ac0e?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1470&q=80" width="250px" /></div>
 <p>This is a paragraph with a gap above it</p>

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