We would like to switch from using react-based inline SVGs to CSS-based SVGs. The primary advantage is performance. SVGs created by React are slow to render. CSS drawn SVGs have a significant perf benefit.

Todolist:

• convert source tree arrows Update sources arrow #4351
• convert Object Inspector arrows (will be done in devtools-core)
• convert source tree domain / file / folder Converted Source Tree SVG's (including Blackbox) to images using CSS styles (#4350) #4477
• convert close button (tabs, breakpoints, watch expressions) Converted tab, breakpoint, watch expression, and search bar Close Button SVG's to Images #4600
• convert step buttons (#4350) Converted Step Button SVG's to images using CSS Styles #4502
• convert blackbox / pretty print Converted blackBox/prettyPrint SVG's to CSS #4386