* an interpolated value, within a *DOM* element, can now be a `function`, enabling a world of *µhtml* extending possibilities, also aligning the behavior with both *lighterhtml* and *hyperHTML*. That is: `<el>${callback}</el>`! The `callback` will be invoked with the *comment* pin/placeholder as unique argument, where its `parentNode` would be the element containing such comment, if needed, and its returned value will be passed along the same mechanism that resolves already all other cases.