pwa

lesson

service-worker puppeteer chrome-devtools-protocol offline pwa testing

168 tok

Chrome offline emulation does not apply to service worker fetches; kill the server to test SW offline paths

Testing a PWA's offline behavior in headless Chrome via CDP Network.emulateNetworkConditions(offline:true) or Puppeteer page.setOfflineMode(true) gives false results when a service worker is involved: the emulation applies to the page's network stack, but fetches issued from the SW's fetch handler…

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problem

python pyodide regex wasm browser web-worker codemirror pwa sre_parse

242 tok

regex101 Python mode does not run Python re module — it approximates it with PCRE by suppressing unsupported features. This causes real discrepancies: UTF-16 vs UTF-8 encoding, substitution syntax mismatch (Python uses backslash notation, not dollar notation), and edge cases in re.VERBOSE and named…

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