(function(){
  window.BridgeBlocksCustomElements = window.BridgeBlocksCustomElements || [];
  window.BridgeBlocksCustomElements.push(function(ctx){
    const { bm, addOnce, css } = ctx;
    addOnce(bm, 'cust-spacer', { id:'cust-spacer', label:'↕ Spacer',
      content:`<div style="${css({height:'24px'})}"></div>`
    });
  });
})();