highlight

defines the content and look (font color, background color) of the text in the input

function highlight;

Example

// code syntax highlighting
function highlight(code){
  code = webix.template.escape(code);
  code = code.replace(/var|const|let/g, "<span class='variable'>$&</span>");
  code = code.replace(/function/g, "<span class='function'>$&</span>");
  // ... other key words
  return code;
}
 
webix.ui({    
  view:"texthighlight",
  type:"textarea",
  highlight:highlight
});

Related samples

TextHighlight: Basic

Details

Do not try to use CSS rules for sizes and positioning (e.g. padding, margin, font-weight, font-size), because this will break positioning inside the text input.

.variable{
  color:red;
}