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Not sure about page.html.twig. Would have to dig around...

In node.html.twig:

{% set newClassNameVar = "standard" %}

{% if node.type.entity.label == "program" %}
    {% set newClassNameVar = "program" %}
{% endif %}

<div class="{{ newClassNameVar }}"></div>

Or:

{%
  set newClassNameVar = [
    node.type.entity.label == 'Program' ? 'Program' : 'Not Program'
  ]
%}

<div{{ attributes.addClass(newClassNameVar) }}></div>

Not sure about page.html.twig. Would have to dig around...

In node.html.twig:

{%
  set newClassNameVar = [
    node.type.entity.label == 'Program' ? 'Program' : 'Not Program'
  ]
%}

<div{{ attributes.addClass(newClassNameVar) }}></div>

or:

{%
  set newClassNameVar = [
    node.bundle == 'content__type' ? 'set-yes-class' : 'set-no-class'
  ]
%}

<div{{ attributes.addClass(newClassNameVar) }}></div>

use debug such as {{ dump(_context | keys) }} to see what is available and best suits your use case.

Not sure about page.html.twig. Would have to dig around...

In node.html.twig:

{% set newClassNameVar = "standard" %}

{% if node.type.entity.label == "program" %}
    {% set newClassNameVar = "program" %}
{% endif %}

then:

<div class="{{ newClassNameVar }}"></div>

Or:

{%
  set newClassNameVar = [
    node.type.entity.label == 'Program' ? 'Program' : 'Not Program'
  ]
%}

<div{{ attributes.addClass(newClassNameVar) }}></div>

Not sure about page.html.twig. Would have to dig around...

In node.html.twig:

{% set newClassNameVar = "standard" %}

{% if node.type.entity.label == "program" %}
    {% set newClassNameVar = "program" %}
{% endif %}
 
<div class="{{ newClassNameVar }}"></div>

Or:

{%
  set newClassNameVar = [
    node.type.entity.label == 'Program' ? 'Program' : 'Not Program'
  ]
%}

<div{{ attributes.addClass(newClassNameVar) }}></div>

Not sure about page.html.twig. Would have to dig around...

In node.html.twig:

{% set newClassNameVar = "standard" %}

{% if node.type.entity.label == "program" %}
    {% set newClassNameVar = "program" %}
{% endif %}

then:

<div class="{{ newClassNameVar }}"></div>

Not sure about page.html.twig. Would have to dig around...

In node.html.twig:

{% set newClassNameVar = "standard" %}

{% if node.type.entity.label == "program" %}
    {% set newClassNameVar = "program" %}
{% endif %}

then:

<div class="{{ newClassNameVar }}"></div>

Or:

{%
  set newClassNameVar = [
    node.type.entity.label == 'Program' ? 'Program' : 'Not Program'
  ]
%}

<div{{ attributes.addClass(newClassNameVar) }}></div>