curriculum/challenges/english/blocks/bootstrap/bad87fee1348bd9aec908853.md
Recall that in addition to class attributes, you can give each of your elements an id attribute.
Each id must be unique to a specific element and used only once per page.
Let's give a unique id to each of our div elements of class well.
Remember that you can give an element an id like this:
<div class="well" id="center-well">
Give the well on the left the id of left-well. Give the well on the right the id of right-well.
Your left well should have the id of left-well.
const column = document.querySelectorAll('.col-xs-6')[0];
const leftWall = column?.querySelectorAll(`:scope ${'#left-well'}`);
assert.lengthOf(leftWall,1)
Your right well should have the id of right-well.
const column = document.querySelectorAll('.col-xs-6')[1];
const rightWall = column?.querySelectorAll(`:scope ${'#right-well'}`);
assert.lengthOf(rightWall,1)
<div class="container-fluid">
<h3 class="text-primary text-center">jQuery Playground</h3>
<div class="row">
<div class="col-xs-6">
<div class="well">
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
</div>
</div>
<div class="col-xs-6">
<div class="well">
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
</div>
</div>
</div>
</div>
<div class="container-fluid">
<h3 class="text-primary text-center">jQuery Playground</h3>
<div class="row">
<div class="col-xs-6">
<div class="well" id="left-well">
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
</div>
</div>
<div class="col-xs-6">
<div class="well" id="right-well">
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
<button class="btn btn-default target"></button>
</div>
</div>
</div>
</div>