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const element = document.querySelector('#example');
console.log(element.matches('.foo')); // true

<div id="example" class="foo bar"></div>

###Element.matches()

element.matches(selectorString)

According to MDN Web Docs:

The Element.matches() method returns true if the element would be selected by the specified selector string; otherwise, returns false.

Therefore, you can use Element.matches() to determine if an element contains a class.

const element = document.querySelector('#example');
console.log(element.matches('.foo')); // true

<div id="example" class="foo bar"></div>

View Browser Compatibility

Element.matches()

element.matches(selectorString)

According to MDN Web Docs:

The Element.matches() method returns true if the element would be selected by the specified selector string; otherwise, returns false.

Therefore, you can use Element.matches() to determine if an element contains a class.

const element = document.querySelector('#example');
console.log(element.matches('.foo')); // true

<div id="example" class="foo bar"></div>

View Browser Compatibility

const element = document.querySelector('#example');
console.log(element.matches('.foo')); // true

<div id="example" class="foo bar"></div>

###Element.matches()

According to MDN Web Docs:

The Element.matches() method returns true if the element would be selected by the specified selector string; otherwise, returns false.

Therefore, you can use Element.matches() to determine if an element contains a class.

const element = document.querySelector('#example');
console.log(element.matches('.foo')); // true

<div id="example" class="foo bar"></div>

View Browser Compatibility

###Element.matches()

element.matches(selectorString)

According to MDN Web Docs:

The Element.matches() method returns true if the element would be selected by the specified selector string; otherwise, returns false.

Therefore, you can use Element.matches() to determine if an element contains a class.

const element = document.querySelector('#example');
console.log(element.matches('.foo')); // true

<div id="example" class="foo bar"></div>

View Browser Compatibility