Question: I'm using tumblr CSS and I want certain symbols, like `/` (slash) to always appear in **bold** even when the main text is not. I know I can use `<b>/</b>`, but I was wondering if there is another way.

For example, I know how to format all `<small>` text to appear in bold:

```
small { 
  font-weight: bold;
}

```

I would like to use the same method to automatically transform `/` to **bold**.

Answer: 
If I understood correctly, you want to plot discontinuity in `u(x,y)` a 2D surface as a line and associate as a field the jump in `u()` with `d(x) = u(x+,0) - u(x-,0)`

Theorically speaking, it should be possible to use a Programmable Filter or develop a ParaView Filter which could take advantage of your filter PlotOverLine and use the lines slightly above and below as its first parameters and use the output line as last parameter (or create it as output).

The different parameters are exposed in the PF script in the array `inputs`. The question of the order of the parameters can be addressed with a special field 'LineType' for example indicating which is above and which is below.

This way, maybe you could explicitly compute the fields `u(x+,0)` and `u(x-,0)` and then the jump field `d(x)` to finally associate it to the output line.

I'm well aware this is more a suggestion about how it could be done than a real answer but I wanted to share ideas.
I put together a Programmable Filter.
I do not know if this is the most efficient way to do it, but it works.

```
programmableFilter1 = ProgrammableFilter(Input=[plotOverLineBot,plotOverLineTop])
programmableFilter1.Script = """
import vtk.util.numpy_support as ns
import numpy as np

input_bot = self.GetInputDataObject(0, 0);
input_top = self.GetInputDataObject(0, 1);
output = self.GetPolyDataOutput()
#output.ShallowCopy(input_bot)

npts_bot = input_bot.GetNumberOfPoints()
npts_top = input_top.GetNumberOfPoints()
if ( npts_bot == npts_top ) :
    print( "Number of points: " + str(npts_bot) )
    u_bot = input_bot.GetPointData().GetArray("displacement")
    u_top = input_top.GetPointData().GetArray("displacement")
    u_bot_np = ns.vtk_to_numpy(u_bot)
    u_top_np = ns.vtk_to_numpy(u_top)
    u_jump_np = np.subtract(u_top_np, u_bot_np)
    u_jump = ns.numpy_to_vtk(u_jump_np)
    u_jump.SetName("displacement jump");
    output.GetPointData().AddArray(u_jump)
else :
    pass
"""

programmableFilter1.RequestInformationScript = ''
programmableFilter1.RequestUpdateExtentScript = ''
programmableFilter1.PythonPath = ''
RenameSource("Programmable Filter - Jumps", programmableFilter1)

```