text: /* WARNING: onunload cannot cancel unmounting in mithril@1.x */
  this.onunload = function(e) {
      if (condition) e.preventDefault()
  }
  
  // Existing comment
  /* WARNING: onunload cannot cancel unmounting in mithril@1.x */
  this.onunload = function(e) {
      if (condition) e.preventDefault()
  }
  
  this.onunload = function(e) {
      // ...
  }
  