You can use the :has() CSS pseudo-class.

See browser support at Caniuse.com.

I don’t think you can select the parent in CSS only.

But as you already seem to have an .active class, it would be easier to move that class to the li (instead of the a). That way you can access both the li and the a via CSS only.

You can use this script:

*! > input[type=text] { background: #000; }

This will select any parent of a text input. But wait, there's still much more. If you want, you can select a specified parent:

.input-wrap! > input[type=text] { background: #000; }

Or select it when it's active:

.input-wrap! > input[type=text]:focus { background: #000; }

Check out this HTML:

<div class="input-wrap">
    <input type="text" class="Name"/>
    <span class="help hide">Your name sir</span>
</div>

You can select that span.help when the input is active and show it:

.input-wrap! .help > input[type=text]:focus { display: block; }

There are many more capabilities; just check out the documentation of the plugin.

BTW, it works in Internet Explorer.

As mentioned by a couple of others, there isn't a way to style an element's parent/s using just CSS but the following works with jQuery:

$("a.active").parents('li').css("property", "value");

You can use :has() pseudo-class (status: working draft, specifications, MDN, caniuse) for this:

li:has(> a.active) {
  outline: thin dotted red;
}

<ul>
  <li><a href="#">a</a></li>
  <li><a href="#" class="active">a.active</a></li>
  <li><a href="#">a</a></li>
</ul>

In fact, this pseudo-class can be used to match an element that has a specific element as child, grand child, next sibling or subsequent sibling:

section, h1, p {
  font-size: 1rem;
  margin-top: 1rem;
  margin-bottom: 1rem;
}

h1:has(> .ref) {
  outline: thin dotted red;
}

h1:has(.ref) {
  outline: thin dotted red;
}

h1:has(+ .ref) {
  outline: thin dotted red;
}

h1:has(~ .ref) {
  outline: thin dotted red;
}

<section>
  <h1>
    heading
    <span class="ref">.ref</span>
  </h1>
</section>

<section>
  <h1>
    heading
    <span>
      span
      <span class="ref">.ref</span>
    </span>
  </h1>
</section>

<section>
  <h1>heading</h1>
  <p class="ref">.ref</p>
</section>

<section>
  <h1>heading</h1>
  <p>paragraph</p>
  <p class="ref">.ref</p>
</section>

The concerns I raised in my original answer are still relevant:

For example, if you wrote:

body:has(a.active) { background: red; }

Then the browser will have to wait until it has loaded and parsed everything until the </body> to determine if the page should be red or not.

The pseudo element :focus-within allows a parent to be selected if a descendent has focus.

An element can be focused if it has a tabindex attribute.

Browser support for focus-within

Tabindex

Example

.parent:focus-within {
  background: hsl(199deg, 65%, 73%);
}

/* demo styles */
body {
  margin: 0;
}
.parent {
  background: hsl(0, 0%, 80%);
  min-height: 100vh;
  display: grid;
  place-content: center;
}
.child {
  background: hsl(0, 0%, 0%);
  color: white;
  padding: 3rem;
  outline: 0;
  cursor: pointer;
  font: 18px/1.25 sans-serif;
  width: 20ch;
}

<div class="parent">
  <div class="child" tabindex="0">
    Click or Focus on me, my parent will change.
  </div>
</div>

There isn't a way to do this in CSS 2. You could add the class to the li and reference the a:

li.active > a {
    property: value;
}

In the CSS Selectors 4 specification, CSS introduces a new selector called :has(), which finally lets us select parents. That means is we’ll be able to target a CSS element that has specific children within it. This is already supported in Safari and is also in Chrome 105. The full support table is shown here.

Parent Selectors workings

In CSS, if we want to select something, we use selectors that descend the DOM.

For example, selecting a p tag within a div tag looks like this:

 div p {
   color: red;
}

Until now, couldn’t really select the div tags which had p tags within them, though, and this meant we had to resort to Javascript. The main reason this wasn’t implemented in CSS is that it’s quite an expensive operation to do. CSS is relatively fast to parse, but selecting parent tags requires a relatively significantly larger amount of processing.

Using the :has selector, we can now select div elements which have a p children, or any normal combination of selectors.

For example, selecting a div with a child p now looks like this:

div:has(p) {
  color: red;
}

This will make any div with a child p red.

Combining parent selection with other selectors

Just like any other CSS selector, we can combine this for specific circumstances. For example, if you want to select only div tags which have direct span children:

div:has(> span) {
  color: red;
}

As the vocabulary of :has suggested, it is not just limited to parent selection.

For example, below we can select a span which :has a sibling div:

span:has(+ div) {
color: red;
}

Or even, selecting an element which does not have a child, by using the :not() selector.

For example, the following will select any div which does not have a p child:

div:not(:has(p)) {
 color: red;
}

Selecting elements that only contain text in CSS

One very common problem in CSS is that the :empty tag does not select elements that contain any text - so sometimes an element can contain one space, and :empty will not apply. The :has selector gives us the power to select elements that only contain text nodes and no other child elements.

Although this is not the perfect solution for simply :empty elements with spaces (as this will select any element with just text and no additional HTML DOM elements) - it does give us the ability to select DOM elements with only text nodes, which was not previously possible. We can achieve this with the following code:

div:not(:has(*)) {
  background: green;
}

Try to switch a to block display, and then use any style you want. The a element will fill the li element, and you will be able to modify its look as you want. Don't forget to set li padding to 0.

li {
  padding: 0;
  overflow: hidden;
}
a {
  display: block;
  width: 100%;
  color: ..., background: ..., border-radius: ..., etc...
}
a.active {
  color: ..., background: ...
}

The CSS selector “General Sibling Combinator” could maybe used for what you want:

E ~ F {
    property: value;
}

This matches any F element that is preceded by an E element.

This is the most discussed aspect of the Selectors Level 4 specification. With this, a selector will be able to style an element according to its child by using :has().

For example:

body:has(a:hover) {
   background: red;
}

will set a red background-color if the user hovers over any anchor.

Not in CSS 2 as far as I'm aware. CSS 3 has more robust selectors but is not consistently implemented across all browsers. Even with the improved selectors, I don't believe it will accomplish exactly what you've specified in your example.

I know the OP was looking for a CSS solution but it is simple to achieve using jQuery. In my case I needed to find the <ul> parent tag for a <span> tag contained in the child <li>. jQuery has the :has selector so it's possible to identify a parent by the children it contains:

$("ul:has(#someId)")

will select the ul element that has a child element with id someId. Or to answer the original question, something like the following should do the trick (untested):

$("li:has(.active)")

You might try to use hyperlink as the parent, and then change the inner elements on hover. Like this:

a.active h1 {color:red;}

a.active:hover h1 {color:green;}

a.active h2 {color:blue;}

a.active:hover h1 {color:yellow;}

This way you can change the style in multiple inner tags, based on the rollover of the parent element.

Here's a hack using pointer-events with hover:

<!doctype html>
<html>
    <head>
        <title></title>
        <style>
/* accessory */
.parent {
    width: 200px;
    height: 200px;
    background: gray;
}
.parent, 
.selector {
    display: flex;
    justify-content: center;
    align-items: center;
}
.selector {
    cursor: pointer;
    background: silver;
    width: 50%;
    height: 50%;
}
        </style>
        <style>
/* pertinent */
.parent {
    background: gray;
    pointer-events: none;
}
.parent:hover {
    background: fuchsia;
}
.parent 
.selector {
    pointer-events: auto;
}
        </style>
    </head>
    <body>
        <div class="parent">
            <div class="selector"></div>
        </div>
    </body>
</html>

The CSS parent selector (also know as the :has() selector) has finally landed in Safari TP 137. The feature is currently being implementated in Chrome as well. (MDN Documentation)

Parent selection is done via the pseudo-class :has(). For example, div:has(> .child) will select all <div> elements with a child having a child class.

Other examples:

Selecting direct parent of an element

<div>
  <p>Child Element</p>
</div>

div:has(> p)

Selecting all the parents of an element

<div id="grandparent">
      <div id="parent">
            <div id="child"></div>
      <div>
</div>

The following selector will select both grandparent and parent

div:has(.child)

You can also use it for nested selectors and even with other pseudo classes:

div:has(> :nth-child(10))

Other valid CSS operators can be used to customize the query.

Keep an eye on caniuse.com/css-has for browser compatibility.

Currently there is no parent selector & it is not even being discussed in any of the talks of W3C. You need to understand how CSS is evaluated by the browser to actually understand if we need it or not.

There is a lot of technical explanation here.

Jonathan Snook explains how CSS is evaluated.

Chris Coyier on the talks of Parent selector.

Harry Roberts again on writing efficient CSS selectors.

But Nicole Sullivan has some interesting facts on positive trends.

These people are all top class in the field of front end development.

Just an idea for horizontal menu...

Part of HTML

<div class='list'>
  <div class='item'>
    <a>Link</a>
  </div>
  <div class='parent-background'></div>
  <!-- submenu takes this place -->
</div>

Part of CSS

/* Hide parent backgrounds... */
.parent-background {
  display: none; }

/* ... and show it when hover on children */
.item:hover + .parent-background {
  display: block;
  position: absolute;
  z-index: 10;
  top: 0;
  width: 100%; }

Updated demo and the rest of code

Another example how to use it with text-inputs - select parent fieldset

There's a plugin that extends CSS to include some non-standard features that can really help when designing websites. It's called EQCSS.

One of the things EQCSS adds is a parent selector. It works in all browsers, Internet Explorer 8 and up. Here's the format:

@element 'a.active' {
  $parent {
    background: red;
  }
}

So here we've opened an element query on every element a.active, and for the styles inside that query, things like $parent make sense, because there's a reference point. The browser can find the parent, because it's very similar to parentNode in JavaScript.

Here's a demo of $parent and another $parent demo that works in Internet Explorer 8, as well as a screenshot in case you don't have Internet Explorer 8 around to test with.

EQCSS also includes meta-selectors: $prev for the element before a selected element and $this for only those elements that match an element query, and more.

It's now 2019, and the latest draft of the CSS Nesting Module actually has something like this. Introducing @nest at-rules.

3.2. The Nesting At-Rule: @nest

While direct nesting looks nice, it is somewhat fragile. Some valid nesting selectors, like .foo &, are disallowed, and editing the selector in certain ways can make the rule invalid unexpectedly. As well, some people find the nesting challenging to distinguish visually from the surrounding declarations.

To aid in all these issues, this specification defines the @nest rule, which imposes fewer restrictions on how to validly nest style rules. Its syntax is:

@nest = @nest <selector> { <declaration-list> }

The @nest rule functions identically to a style rule: it starts with a selector, and contains declarations that apply to the elements the selector matches. The only difference is that the selector used in a @nest rule must be nest-containing, which means it contains a nesting selector in it somewhere. A list of selectors is nest-containing if all of its individual complex selectors are nest-containing.

(Copy and pasted from the URL above).

Example of valid selectors under this specification:

.foo {
  color: red;
  @nest & > .bar {
    color: blue;
  }
}
/* Equivalent to:
   .foo { color: red; }
   .foo > .bar { color: blue; }
 */

.foo {
  color: red;
  @nest .parent & {
    color: blue;
  }
}
/* Equivalent to:
   .foo { color: red; }
   .parent .foo { color: blue; }
 */

.foo {
  color: red;
  @nest :not(&) {
    color: blue;
  }
}
/* Equivalent to:
   .foo { color: red; }
   :not(.foo) { color: blue; }
 */

Technically there is no direct way to do this. However, you can sort that out with either jQuery or JavaScript.

However, you can do something like this as well.

a.active h1 {color: blue;}
a.active p {color: green;}

jQuery

$("a.active").parents('li').css("property", "value");

If you want to achieve this using jQuery here is the reference for the jQuery parent selector.

The short answer is NO; we don't have a parent selector at this stage in CSS, but if you don't have to swap the elements or classes anyway, the second option is using JavaScript. Something like this:

var activeATag = Array.prototype.slice.call(document.querySelectorAll('a.active'));

activeATag.map(function(x) {
  if(x.parentNode.tagName === 'LI') {
    x.parentNode.style.color = 'red'; // Your property: value;
  }
});

Or a shorter way if you use jQuery in your application:

$('a.active').parents('li').css('color', 'red'); // Your property: value;

Although there is no parent selector in standard CSS at present, I am working on a (personal) project called axe (ie. Augmented CSS Selector Syntax / ACSSSS) which, among its 7 new selectors, includes both:

1. an immediate parent selector < (which enables the opposite selection to >)
2. an any ancestor selector ^ (which enables the opposite selection to [SPACE])

axe is presently in a relatively early BETA stage of development.

See a demo here:

.parent {
  float: left;
  width: 180px;
  height: 180px;
  margin-right: 12px;
  background-color: rgb(191, 191, 191);
}

.child {
  width: 90px;
  height: 90px;
  margin: 45px;
  padding-top: 12px;
  font-family: sans-serif;
  text-align: center;
  font-size: 12px;
  background-color: rgb(255, 255, 0);
}

.child.using-axe < .parent {
  background-color: rgb(255, 0, 0);
}

<div class="parent">
  <div class="child"></div>
</div>

<div class="parent">
  <div class="child using-axe">Here, the axe parent selector turns the outer square red.</div>
</div>


<script src="https://rouninmedia.github.io/axe/axe.js"></script>

In the example above < is the immediate parent selector, so

• .child.using-axe < .parent

means:

any immediate parent of .child.using-axe which is .parent

You could alternatively use:

• .child.using-axe < div

which would mean:

any immediate parent of .child.using-axe which is a div

The W3C excluded such a selector because of the huge performance impact it would have on a browser.

Edit 2024-10-15

There is now a :has() CSS feature and, unless that fails to achieve the desired results, the following should be ignored! Because content remains mainly for historical reasons only.

Any ideas?

CSS4 will be fancy if it adds some hooks into walking backwards. Until then it is possible (though not advisable) to use checkbox and/or radio inputs to break the usual way that things are connected, and through that also allow CSS to operate outside of its normal scope...

/* Hide things that may be latter shown */
.menu__checkbox__selection,
.menu__checkbox__style,
.menu__hidden {
  display: none;
  visibility: hidden;
  opacity: 0;
  filter: alpha(opacity=0); /* Old Microsoft opacity */
}


/* Base style for content and style menu */
.main__content {
  background-color: lightgray;
  color: black;
}

.menu__hidden {
  background-color: black;
  color: lightgray;
  /* Make list look not so _listy_ */
  list-style: none;
  padding-left: 5px;
}

.menu__option {
  box-sizing: content-box;
  display: block;
  position: static;
  z-index: auto;
}

/* ▼ - \u2630 - Three Bars */
/*
.menu__trigger__selection::before {
  content: '\2630';
  display: inline-block;
}
*/

/* ▼ - Down Arrow */
.menu__trigger__selection::after {
  content: "\25BC";
  display: inline-block;
  transform: rotate(90deg);
}


/* Customize to look more `select` like if you like */
.menu__trigger__style:hover,
.menu__trigger__style:active {
  cursor: pointer;
  background-color: darkgray;
  color: white;
}


/**
 * Things to do when checkboxes/radios are checked
 */

.menu__checkbox__selection:checked + .menu__trigger__selection::after,
.menu__checkbox__selection[checked] + .menu__trigger__selection::after {
  transform: rotate(0deg);
}

/* This bit is something that you may see elsewhere */
.menu__checkbox__selection:checked ~ .menu__hidden,
.menu__checkbox__selection[checked] ~ .menu__hidden {
  display: block;
  visibility: visible;
  opacity: 1;
  filter: alpha(opacity=100); /* Microsoft!? */
}


/**
 * Hacky CSS only changes based off non-inline checkboxes
 * ... AKA the stuff you cannot unsee after this...
 */
.menu__checkbox__style[id="style-default"]:checked ~ .main__content {
  background-color: lightgray;
  color: black;
}

.menu__checkbox__style[id="style-default"]:checked ~ .main__content .menu__trigger__style[for="style-default"] {
  color: darkorange;
}

.menu__checkbox__style[id="style-one"]:checked ~ .main__content {
  background-color: black;
  color: lightgray;
}

.menu__checkbox__style[id="style-one"]:checked ~ .main__content .menu__trigger__style[for="style-one"] {
  color: darkorange;
}

.menu__checkbox__style[id="style-two"]:checked ~ .main__content {
  background-color: darkgreen;
  color: red;
}

.menu__checkbox__style[id="style-two"]:checked ~ .main__content .menu__trigger__style[for="style-two"] {
  color: darkorange;
}

<!--
  This bit works, but will one day cause troubles,
  but truth is you can stick checkbox/radio inputs
  just about anywhere and then call them by id with
  a `for` label. Keep scrolling to see what I mean
-->
<input type="radio"
       name="colorize"
       class="menu__checkbox__style"
       id="style-default">
<input type="radio"
       name="colorize"
       class="menu__checkbox__style"
       id="style-one">
<input type="radio"
       name="colorize"
       class="menu__checkbox__style"
       id="style-two">


<div class="main__content">

  <p class="paragraph__split">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
    tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
    quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
  </p>

  <input type="checkbox"
         class="menu__checkbox__selection"
         id="trigger-style-menu">
  <label for="trigger-style-menu"
         class="menu__trigger__selection"> Theme</label>

  <ul class="menu__hidden">
    <li class="menu__option">
      <label for="style-default"
             class="menu__trigger__style">Default Style</label>
    </li>

    <li class="menu__option">
      <label for="style-one"
             class="menu__trigger__style">First Alternative Style</label>
    </li>

    <li class="menu__option">
      <label for="style-two"
             class="menu__trigger__style">Second Alternative Style</label>
    </li>
  </ul>

  <p class="paragraph__split">
    consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse
    cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non
    proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
  </p>

</div>

... pretty gross, but with just CSS and HTML it is possible to touch and re-touch anything but the body and :root from just about anywhere by linking the id and for properties of radio/checkbox inputs and label triggers; likely someone'll show how to re-touch those at some point.

One additional caveat is that only one input of a specific id maybe used, first checkbox/radio wins a toggled state in other words... But multiple labels can all point to the same input, though that would make both the HTML and CSS look even grosser.

... I'm hoping that there is some sort of workaround that exists native to CSS Level 2...

I am not sure about the other pseudo classes, but I :checked for pre-CSS 3. If I remember correctly, it was something like [checked] which is why you may find it in the above code, for example,

.menu__checkbox__selection:checked ~ .menu__hidden,
.menu__checkbox__selection[checked] ~ .menu__hidden {
 /* rules: and-stuff; */
}

... but for things like ::after and :hover, I'm not at all certain in which CSS version those first appeared.

That all stated, please don't ever use this in production, not even in anger. As a joke sure, or in other words just because something can be done does not always mean it should.

Try this...

This solution uses plain CSS2 rules with no Javascript and works in all browsers, old and new. When clicked, the child anchor tag activates its active pseudo-class event. It then simply hides itself, allowing the active event to bubble up to the parent li tag who then restyles himself and reveals his anchor child again with a new style. The child has styled the parent.

Using your example:

<ul>
    <li class="listitem">
        <a class="link" href="#">This is a Link</a>
    </li>
</ul>

Now apply these styles with the active pseudo-class on a to restyle the parent li tag when the link is clicked:

a.link {
    display: inline-block;
    color: white;
    background-color: green;
    text-decoration: none;
    padding: 5px;
}

li.listitem {
    display: inline-block;
    margin: 0;
    padding: 0;
    background-color: transparent;
}

/* When this 'active' pseudo-class event below fires on click, it hides itself,
triggering the active event again on its parent which applies new styles to itself and its child. */

a.link:active {
    display: none;
}

.listitem:active {
    background-color: blue;
}

.listitem:active a.link {
    display: inline-block;
    background-color: transparent;
}

You should see the link with a green background now change to the list item's blue background on click.

turns to

on click.

Changing parent element based on child element can currently only happen when we have an <input> element inside the parent element. When an input gets focus, its corresponding parent element can get affected using CSS.

Following example will help you understand using :focus-within in CSS.

.outer-div {
  width: 400px;
  height: 400px;
  padding: 50px;
  float: left
}

.outer-div:focus-within {
  background: red;
}

.inner-div {
  width: 200px;
  height: 200px;
  float: left;
  background: yellow;
  padding: 50px;
}

<div class="outer-div">
  <div class="inner-div">
    I want to change outer-div(Background color) class based on inner-div. Is it possible?
    <input type="text" placeholder="Name" />
  </div>
</div>

No, you cannot select the parent in CSS only.

But as you already seem to have an .active class, it would be easier to move that class to the li (instead of the a). That way you can access both the li and the a via CSS only.

There no css (and therefore in css preprocessors) parent selector due to "The major reasons for the CSS Working Group previously rejecting proposals for parent selectors are related to browser performance and incremental rendering issues."