The devtools features you wish you had, available in Polypane
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Polypane, a standalone browser for web developers, already supports many features developers have been requesting from browser devtools. These include built-in contrast checkers (element-level, color picker, and full-page), HTML validation with Prettier formatting, pixel-perfect image overlays, ruler and grid alignment tools, font rendering insights, persistent user styles via snippets, overflow detection, per-pane network and JS toggling, @starting-style inspection, atomic CSS class editing, 22 visual simulators including 9 color blindness modes, stacking context and offset parent debugging, flexible screenshot options, and a built-in responsive design mode with multiple synced viewports.
