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HTML 

              
                   <div class="dx-viewport demo-container">
      <div class="button-container">
        <div id="show-popup-button"></div>
        <div class="label"> A native scrollable container </div>
      </div>

      <div class="button-container">
        <div id="show-popup-with-scrollview-button"></div>
        <div class="label"> The ScrollView </div>
      </div>
    </div>

    <div id="popup">
      <div class="popup-content">
        <div class="caption">Description</div>
        In the heart of LA's business district, the Downtown Inn has a welcoming staff and award winning restaurants that remain open 24 hours a day. Use our conference room facilities to conduct
        meetings and have a drink at our beautiful rooftop bar.
        <br /><br />
        <div class="content">
          <div>
            <div class="caption">Features</div>
            <div>Concierge</div>
            <div>Restaurant</div>
            <div>Valet Parking</div>
            <div>Fitness Center</div>
            <div>Sauna</div>
            <div>Airport Shuttle</div>
          </div>
          <div>
            <div class="caption">Rooms</div>
            <div>Climate control</div>
            <div>Air conditioning</div>
            <div>Coffee/tea maker</div>
            <div>Iron/ironing</div>
          </div>
        </div>
      </div>
    </div>
    <div id="popup-with-scrollview"></div>
!

CSS 

              
                .label {
  color: rgba(51, 51, 51, 0.6);
  font-size: 12px;
}

.demo-container {
  height: 450px;
  display: flex;
  align-items: center;
  flex-direction: column;
  justify-content: center;
  gap: 40px;
}

.button-container {
  display: flex;
  align-items: center;
  flex-direction: column;
  justify-content: center;
  gap: 15px;
}

.dx-popup-content {
  font-size: 12px;
}

.caption {
  padding-bottom: 8px;
  font-weight: 500;
}

.content {
  display: flex;
  justify-content: space-between;
}

.popup-content {
  height: 100%;
  width: 100%;
}
!

JS 

              
                $(() => {
  $('#show-popup-button').dxButton({
    text: 'Show Popup',
    width: 300,
    type: 'default',
    onClick() {
      popup.show();
    },
  });

  $('#show-popup-with-scrollview-button').dxButton({
    text: 'Show Popup',
    width: 300,
    onClick() {
      popupWithScrollView.show();
    },
  });

  const popup = $('#popup')
    .dxPopup({
      width: 360,
      height: 320,
      visible: false,
      title: 'Downtown Inn',
      hideOnOutsideClick: true,
      showCloseButton: true,
      toolbarItems: [
        {
          widget: 'dxButton',
          toolbar: 'bottom',
          location: 'center',
          options: {
            width: 300,
            text: 'Book',
            type: 'default',
            stylingMode: 'contained',
            onClick() {
              popup.hide();
            },
          },
        },
      ],
    })
    .dxPopup('instance');

  const popupWithScrollView = $('#popup-with-scrollview')
    .dxPopup({
      width: 360,
      height: 320,
      visible: false,
      title: 'Downtown Inn',
      hideOnOutsideClick: true,
      showCloseButton: true,
      toolbarItems: [
        {
          widget: 'dxButton',
          toolbar: 'bottom',
          location: 'center',
          options: {
            width: 300,
            text: 'Book',
            type: 'default',
            stylingMode: 'contained',
            onClick() {
              popupWithScrollView.hide();
            },
          },
        },
      ],
      contentTemplate() {
        const $scrollView = $('<div/>');

        $scrollView.append($('<div/>').html(htmlContent));

        $scrollView.dxScrollView({
          width: '100%',
          height: '100%',
        });

        return $scrollView;
      },
    })
    .dxPopup('instance');
});

const htmlContent = "<div class='caption'>Description</div>In the heart of LA's business district, the Downtown Inn has a welcoming staff and award winning restaurants that remain open 24 hours a day. Use our conference room facilities to conduct meetings and have a drink at our beautiful rooftop bar.<br><br><div class='content'><div><div class='caption'>Features</div><div>Concierge</div><div>Restaurant</div><div>Valet Parking</div><div>Fitness Center</div><div>Sauna</div><div>Airport Shuttle</div></div><div><div class='caption'>Rooms</div><div>Climate control</div><div>Air conditioning</div><div>Coffee/tea maker</div><div>Iron/ironing</div></div></div>";
!
999px

Console