htmlLabels suport And CSS single Control

[WingDust]

Is your feature request related to a problem? Please describe.

• I use mermaid within flowchart to write my project structure model.

• I have a thing that i need to a few label to descirbed ,And for clearly identify each label to make every label have own color font it will be great .

• so I use htmllabel in subgraph such as span ...

• Through refer to the many data I saw the <br> it's work but span to don't work in screenshot.

• in rendering <span style= "color:red">AB</span> it has syntax error

Describe the solution you'd like

• have two problem
  • in flowchart subgraph's title can use some other HtmlLabel like <span>
  • I can just for this label in title to write css to control

Describe alternatives you've considered

Additional context
Add any other context or screenshots about the feature request here.

[vantoan8x]

add option config below "theme",

securityLevel : "snoop"

you can use the html formating in this case.

[slokhorst]

The same issue is evident in the official docs for Flowchart (section "Css classes"):