Zero Greediness of Flex Elements in CSS

If flex-grow is zero for an element, that element will not participate in the distribution of available space. By default, greediness is zero, so elements without a specified flex-grow do not share available space with each other.

Let's do some calculations for example. Let's say we have three flex items, each with a width of 100px. Let's say the first item has no flex-grow (or it's 0), the second item has flex-grow equal to 2, and the third item has 3.

Let the parent width be 500px. Then the free space will be 200px, and for one unit of flex-grow there will be 200px / 5 = 40px. It turns out that the width of the first element will remain 100px, since it does not participate in the distribution, the width of the second will be 100px + 2 * 40px = 180px, and the width of the third is 100px + 3 * 40px = 220px.

Practical tasks

In all of the problems below, you'll be presented with some code with flex items that have a width and flex-grow. Given the code, calculate what sizes each item will have. Then run the code and check your calculations by measuring the actual widths of the items.

<div class="parent">
	<div class="child elem1">1</div>
	<div class="child elem2">2</div>
	<div class="child elem3">3</div>
</div>

.parent {
	display: flex;
	width: 500px;
	height: 200px;
	border: 1px solid red;
}
.child {
	height: 50px;
	border: 1px solid green;
}
.elem1 {
	width: 200px;
	flex-grow: 0;
}
.elem2 {
	width: 100px;
	flex-grow: 1;
}
.elem3 {
	width: 100px;
	flex-grow: 1;
}

<div class="parent">
	<div class="child elem1">1</div>
	<div class="child elem2">2</div>
	<div class="child elem3">3</div>
</div>

.parent {
	display: flex;
	width: 900px;
	height: 200px;
	border: 1px solid red;
}
.child {
	height: 50px;
	border: 1px solid green;
}
.elem1 {
	width: 300px;
	flex-grow: 0;
}
.elem2 {
	width: 200px;
	flex-grow: 3;
}
.elem3 {
	width: 100px;
	flex-grow: 2;
}

<div class="parent">
	<div class="child elem1">1</div>
	<div class="child elem2">2</div>
	<div class="child elem3">3</div>
	<div class="child elem4">4</div>
</div>

.parent {
	display: flex;
	width: 700px;
	height: 200px;
	border: 1px solid red;
}
.child {
	height: 50px;
	border: 1px solid green;
}
.elem1 {
	width: 200px;
	flex-grow: 0;
}
.elem2 {
	width: 200px;
	flex-grow: 0;
}
.elem3 {
	width: 100px;
	flex-grow: 1;
}
.elem4 {
	width: 100px;
	flex-grow: 1;
}