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<h1>Basic document flow</h1>
<p>I am a basic block level element. My adjacent block level elements sit on new lines below me.</p>
<p>By default we span 100% of the width of our parent element, and we are as tall as our child content. Our total width and height is our content + padding + border width/height.</p>
<p>We are separated by our margins. Because of margin collapsing, we are separated by the width of one of our margins, not both.</p>
<p>inline elements <span>like this one</span> and <span>this one</span> sit on the same line as one another, and adjacent text nodes, if there is space on the same line. Overflowing inline elements will <span>wrap onto a new line if possible (like this one containing text)</span>, or just go on to a new line if not, much like this image will do: <img src="https://mdn.mozillademos.org/files/13360/long.jpg"></p>
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