openmct/platform/features/layout/res/templates/elements/line.html

<svg ng-attr-width="{{parameters.gridSize[0] * ngModel.width()}}"
     ng-attr-height="{{parameters.gridSize[1] * ngModel.height()}}">
    <line ng-attr-x1="{{parameters.gridSize[0] * ngModel.x1() + 1}}"
          ng-attr-y1="{{parameters.gridSize[1] * ngModel.y1() + 1}}"
          ng-attr-x2="{{parameters.gridSize[0] * ngModel.x2() + 1}}"
          ng-attr-y2="{{parameters.gridSize[1] * ngModel.y2() + 1}}"
          stroke="lightgray"
          stroke-width="2">
    </line>
</svg>