HTTP/2 200
x-guploader-uploadid: ABgVH8_c-tPSpOZEfKkcsXEBM4i8L0i3twhZWni60W5bYT67w8SrLUhPVRZ0S4a4nBpTKe1I
x-goog-generation: 1752626668249435
x-goog-metageneration: 1
x-goog-stored-content-encoding: identity
x-goog-stored-content-length: 56296
x-goog-meta-goog-reserved-file-mtime: 1752625480
x-goog-hash: crc32c=edPFpw==, md5=MF87eVa/SInXnUBQYBiMOw==
x-goog-storage-class: STANDARD
accept-ranges: none
expires: Thu, 17 Jul 2025 16:22:10 GMT
cache-control: public, max-age=3600
last-modified: Wed, 16 Jul 2025 00:44:28 GMT
etag: W/"305f3b7956bf4889d79d405060188c3b"
content-type: text/html
age: 3569
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
alt-svc: clear
x-content-type-options: nosniff
strict-transport-security: max-age=63072000
content-security-policy: default-src 'self'; script-src 'report-sample' 'self' 'wasm-unsafe-eval' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-EehWlTYp7Bqy57gDeQttaWKp0ukTTEUKGP44h8GVeik=' 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M='; script-src-elem 'report-sample' 'self' 'wasm-unsafe-eval' https://www.google-analytics.com/analytics.js https://www.googletagmanager.com/gtag/js assets.codepen.io production-assets.codepen.io https://js.stripe.com 'sha256-EehWlTYp7Bqy57gDeQttaWKp0ukTTEUKGP44h8GVeik=' 'sha256-XNBp89FG76amD8BqrJzyflxOF9PaWPqPqvJfKZPCv7M='; style-src 'report-sample' 'self' 'unsafe-inline'; object-src 'none'; base-uri 'self'; connect-src 'self' developer.allizom.org bcd.developer.allizom.org bcd.developer.mozilla.org updates.developer.allizom.org updates.developer.mozilla.org https://*.google-analytics.com https://*.analytics.google.com https://*.googletagmanager.com https://incoming.telemetry.mozilla.org https://observatory-api.mdn.allizom.net https://observatory-api.mdn.mozilla.net https://api.github.com/search/issues stats.g.doubleclick.net https://api.stripe.com; font-src 'self'; frame-src 'self' interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net mdn.github.io live-samples.mdn.mozilla.net live-samples.mdn.allizom.net *.mdnplay.dev *.mdnyalp.dev *.play.test.mdn.allizom.net https://v2.scrimba.com https://scrimba.com jsfiddle.net www.youtube-nocookie.com codepen.io survey.alchemer.com https://js.stripe.com; img-src 'self' data: *.githubusercontent.com *.googleusercontent.com *.gravatar.com mozillausercontent.com firefoxusercontent.com profile.stage.mozaws.net profile.accounts.firefox.com developer.mozilla.org mdn.dev interactive-examples.mdn.mozilla.net interactive-examples.mdn.allizom.net wikipedia.org upload.wikimedia.org https://mdn.github.io/shared-assets/ https://mdn.dev/ https://*.google-analytics.com https://*.googletagmanager.com www.gstatic.com; manifest-src 'self'; media-src 'self' archive.org videos.cdn.mozilla.net https://mdn.github.io/shared-assets/; child-src 'self'; worker-src 'self';
x-frame-options: DENY
origin-trial: AxVILwizhbMjxFeHOn1P3R8niO1RJY/smaK4B4d1rLzc1gTaxtXMSaTi+FoigYgCw40uFRDwFcEAeqDR+vVLOW4AAABfeyJvcmlnaW4iOiJodHRwczovL2RldmVsb3Blci5tb3ppbGxhLm9yZyIsImZlYXR1cmUiOiJQcml2YXRlQXR0cmlidXRpb25WMiIsImV4cGlyeSI6MTc0MjA3OTYwMH0=
x-cloud-trace-context: 5e12b08b64ec69579757267f3337d16d
date: Thu, 17 Jul 2025 16:21:39 GMT
server: Google Frontend
via: 1.1 google
vary: Accept-Encoding
content-encoding: gzip
x-cache: miss
How to solve common problems - Learn web development | MDNHow to solve common problems
This section provides solutions to common front-end problems and answers to common questions.
- Design and accessibility
This section lists questions related to aesthetics, page structure, accessibility techniques, etc.
- Solve common CSS problems
This page rounds up questions and answers, and other material on the MDN site that can help you to solve common CSS problems.
- Solve common HTML problems
The following links point to solutions to common everyday problems you'll need to solve with HTML.
- Solve common JavaScript problems
The following links point to solutions to common problems you may encounter when writing JavaScript.
- Tools and setup
This section lists questions related to the tools/software you can use to build websites.
- Web mechanics
This section covers questions relating to general knowledge of the web ecosystem and how it works.
