Fake `display: run-in` with “correct” margin behavior


Previously on “let’s not support display: run-in because it’s complicated and nobody actually uses or wants to use it,” StackOverflow edition…

<ul><li><a href="https://stackoverflow.com/questions/22080141/display-run-in-dropped-in-chrome" rel="nofollow">display: run-in dropped in Chrome?</a></li> <li><a href="https://stackoverflow.com/questions/1577368/style-a-definitition-list-as-simple-key-value-set" rel="nofollow">Style a definitition list as simple key value set</a></li> <li><a href="https://stackoverflow.com/questions/14215939/css-method-instead-of-displayrun-in-to-position-a-block-inline/14217929#14217929" rel="nofollow">CSS method instead of display:run-in; to position a block inline?</a></li> </ul><hr />

I would like the following behavior for h5 elements in my document:

<ul><li>It acts like run-in when followed by a paragraph (p)</li> <li>It acts like block when followed by a heading (h1, …, h6) or something else (ul, etc.)</li> </ul>

This is essentially the <a href="http://www.w3.org/TR/css3-box/#run-in-boxes" rel="nofollow">same behavior as run-in</a> if the contents of headings are wrapped in (or contain) a block; i.e., by changing <h6>…</h6> to <h6><div>…</div></h6> or <h6>…<div /></h6>.

(However, I would prefer not to modify the HTML if possible: it’s generated from markdown via pandoc.)

Here’s what I have so far, using floating inline-blocks. Notice how the margin between the h5 and h6 gets “collapsed.”

<h3>CSS</h3> /* Just some basic styles to start off */ body { line-height: 1.5; } h4,h5,h6 { font-size: 1em; margin: 1em 0; } h4 { background: #fee; } h5 { background: #eef; } h6 { background: #dfd; font-style: italic; font-weight: normal; } /* Now let’s try to emulate `display: run-in`... */ h4,h5,h6 { clear: both; } h5 { float: left; display: inline-block; margin: 0 1em 0 0; } <h3>HTML</h3> <h4>Section</h4> <h5>Heading</h5>

Paragraph here. This is some text to fill out the line and make it wrap, so you can get a feel for how a heading with display: run-in; might look.

<h5>Heading, but without immediately following text</h5> <h6><div>Subheading</div></h6>

There should be as much space between the &lt;h5> and &lt;h6> as there is between the &lt;h4> and &lt;h5>, but it gets “collapsed” because the &lt;h5> floats.

<h5>Heading followed by a list</h5> <ul><li>A list item</li></ul>

<a href="http://jsfiddle.net/47W2C/12/" rel="nofollow">Here is a jsfiddle containing the HTML and CSS.</a><br /><a href="http://jsfiddle.net/47W2C/14/" rel="nofollow">Here is one using run-in for browsers that still support it, like Safari.</a>

Here’s a <a href="http://www.cl.cam.ac.uk/~jf15/StyleTests/Fake-run-in.html" rel="nofollow">demo page</a> from 7 years ago I found that attempts (unsuccessfully) to fake the same behavior.

<h2>Screenshots of Safari</h2>



<img width="548" class="b-lazy" data-src="https://i.stack.imgur.com/WeGTJ.png" data-original="https://i.stack.imgur.com/WeGTJ.png" src="https://etrip.eimg.top/images/2019/05/07/timg.gif" />


Using run-in (expected behavior, with correct margins between the h5 and the h6 or ul):


<img width="548" class="b-lazy" data-src="https://i.stack.imgur.com/FtrYs.png" data-original="https://i.stack.imgur.com/FtrYs.png" src="https://etrip.eimg.top/images/2019/05/07/timg.gif" />



Maybe i have a compromised you would like : <strong><a href="http://jsfiddle.net/47W2C/20/" rel="nofollow">DEMO</a></strong><br />

/* Just some basic styles to start off */ body { line-height: 1.5; } h4,h5,h6 { font-size: 1em; margin: 1em 0; } h4 { background: #fee; } h5 { background: #eef; } h6 { background: #dfd; font-style: italic; font-weight: normal; } /* Now let’s try to emulate `display: run-in`... */ * { clear:left; } h5 { float:left; display: run-in; margin: 0 1em 0 0; } h5:after { content:'.'; position:absolute; background:inherit; width:100%; right:0; z-index:-1; } body { position:relative; /* to include defaut margin of body to draw h5:after element within body */ } p /* + any other phrasing tag you wish */ { clear:none; background:white; }


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