General image guidance is available on the image documentation page.
Featured images have a 2:1 aspect ratio (width:height). The advised dimensions for a featured image is 1100px x 550px.
CMS systems which render images to specific sizes (e.g. by utilising scripts which specify sizing parameters) should set the width and height parameters as per the above guidelines.
'context': {
  'image_featured': {
    'src': '/placeholders/ph-event-01.jpg',
    'alt': 'Actors touching each other\'s faces',
    'caption': 'Supporting caption'
  }
}
        
    
        {% if image_featured %}
  <figure class="uol-featured-image">
    <img
    class="uol-featured-image__img"
    src="{{ image_featured.src }}"
    alt="{{ image_featured.alt | safe }}">
    {% if image_featured.caption %}
      <figcaption
      class="uol-featured-image__caption">
          {{ image_featured.caption | safe }}
      </figcaption>
    {% endif %}
  </figure>
{% endif %}
    
        
        <figure class="uol-featured-image">
    <img class="uol-featured-image__img" src="/placeholders/ph-event-01.jpg" alt="Actors touching each other's faces">
    <figcaption class="uol-featured-image__caption">
        Image caption. May be used for © notices
    </figcaption>
</figure>
        
    
                                // Experiment - let SASS create the media queries...
$featured-image-bottom-margin: (
  "xs": $spacing-6,
  "l": $spacing-7
);
.uol-featured-image {
  @each $key, $val in $featured-image-bottom-margin {
    @include media(">=uol-media-#{$key}") {
      margin-bottom: $val;
    }
  }
  position: relative;
  display: flex;
  flex-direction: column;
  // TODO: Remove IE11 hack
  .no-csspositionsticky & {
    display: block;
  }
  .uol-widget__content & {
    margin-bottom: $spacing-4;
  }
}
  .uol-featured-image__img {
    width: 100%;
    height: auto;
  }
  .uol-featured-image__caption {
    @extend .uol-typography-paragraph-small;
    margin: 0;
    padding: $spacing-2 0 0;
    color: $color-font--x-light;
  }
                            
                            
                        
        
            
            {
  "image_featured": {
    "src": "/placeholders/ph-event-01.jpg",
    "alt": "Actors touching each other's faces",
    "caption": "Image caption. May be used for © notices"
  }
}