Ensure elements with an ARIA role that require child roles contain them

Problem/Motivation

Certain ARIA roles must contain particular children1
Element Location:
.cookiesjsr-service-groups
<ul class="cookiesjsr-service-groups" role="tablist" aria-label="Cookie-instellingen">

To solve this problem, you need to fix the following:
Element has children which are not allowed: li[tabindex]

Related Node
<li class="cookiesjsr-service-group active">

Certain ARIA roles must be contained by particular parents
Ensure elements with an ARIA role that require parent roles are contained by them

Element Location:
#tab-functional
<button class="cookiesjsr-service-group--tab" role="tab" aria-selected="true" tabindex="0" aria-controls="panel-functional" id="tab-functional">Functioneel</button>

To solve this problem, you need to fix the following:
Required ARIA parent role not present: tablist

<li> elements must be contained in a <ul> or <ol>
Ensure li-elements are used semantically

Element Location:
.cookiesjsr-service-group
<li class="cookiesjsr-service-group active">

To solve this problem, you need to fix the following:
List item parent element has a role that is not role="list"