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flow-based content. For example, blog articles benefit from the document-centric |
model that the web is built around, rather than the app-centric services that a |
UI framework like Flutter can deliver. However, you can use Flutter to embed |
interactive experiences into these websites.For more information on how you can use Flutter on the web, |
see Web support for Flutter.<topic_end> |
<topic_start> |
Search Engine Optimization (SEO) |
In general, Flutter is geared towards dynamic application experiences. Flutter’s |
web support is no exception. Flutter web prioritizes performance, fidelity, and |
consistency. This means application output does not align with what search |
engines need to properly index. For web content that is static or document-like, |
we recommend using HTML—just like we do on flutter.dev, |
dart.dev, and pub.dev. You should also |
consider separating your primary application experience—created in Flutter—from |
your landing page, marketing content, and help content—created using |
search-engine optimized HTML.<topic_end> |
<topic_start> |
How do I create an app that also runs on the web? |
See building a web app with Flutter.<topic_end> |
<topic_start> |
Does hot reload work with a web app? |
No, but you can use hot restart. Hot restart is a fast way of seeing your |
changes without having to relaunch your web app and wait for it to compile and |
load. This works similarly to the hot reload feature for Flutter mobile |
development. The only difference is that hot reload remembers your state and hot |
restart doesn’t.<topic_end> |
<topic_start> |
How do I restart the app running in the browser? |
You can either use the browser’s refresh button, |
or you can enter “R” in the console where |
“flutter run -d chrome” is running.<topic_end> |
<topic_start> |
Which web browsers are supported by Flutter? |
Flutter web apps can run on the following browsers:During development, Chrome (on macOS, Windows, and Linux) and Edge (on Windows) |
are supported as the default browsers for debugging your app.<topic_end> |
<topic_start> |
Can I build, run, and deploy web apps in any of the IDEs? |
You can select Chrome or Edge as the target device in |
Android Studio/IntelliJ and VS Code.The device pulldown should now include the Chrome (web) |
option for all channels.<topic_end> |
<topic_start> |
How do I build a responsive app for the web? |
See Creating responsive apps.<topic_end> |
<topic_start> |
Can I use dart:io with a web app? |
No. The file system is not accessible from the browser. |
For network functionality, use the http |
package. Note that security works somewhat |
differently because the browser (and not the app) |
controls the headers on an HTTP request.<topic_end> |
<topic_start> |
How do I handle web-specific imports? |
Some plugins require platform-specific imports, particularly if they use the |
file system, which is not accessible from the browser. To use these plugins |
in your app, see the documentation for conditional imports |
on dart.dev.<topic_end> |
<topic_start> |
Does Flutter web support concurrency? |
Dart’s concurrency support via isolates |
is not currently supported in Flutter web.Flutter web apps can potentially work around this |
by using web workers, |
although no such support is built in.<topic_end> |
<topic_start> |
How do I embed a Flutter web app in a web page? |
You can embed a Flutter web app, |
as you would embed other content, |
in an iframe tag of an HTML file. |
In the following example, replace “URL” |
with the location of your hosted HTML page:If you encounter problems, please file an issue.<topic_end> |
<topic_start> |
How do I debug a web app? |
Use Flutter DevTools for the following tasks:Use Chrome DevTools for the following tasks:<topic_end> |
<topic_start> |
How do I test a web app? |
Use widget tests or integration tests. To learn more about |
running integration tests in a browser, see the Integration testing page.<topic_end> |
<topic_start> |
How do I deploy a web app? |
See Preparing a web app for release.<topic_end> |
<topic_start> |
Does Platform.is work on the web? |
Not currently. |
<topic_end> |
<topic_start>Web renderers |
When running and building apps for the web, you can choose between two different |
renderers. This page describes both renderers and how to choose the best one for |
your needs. The two renderers are:<topic_end> |
<topic_start> |
Command line options |
The --web-renderer command line option takes one of three values, auto, |
html, or canvaskit.This flag can be used with the run or build subcommands. For example:This flag is ignored when a non-browser (mobile or desktop) device |
target is selected.<topic_end> |
<topic_start> |
Runtime configuration |
To override the web renderer at runtime:The web renderer can’t be changed after the Flutter engine startup process |
begins in main.dart.js.info Note |
As of Flutter 3.7.0, setting a window.flutterWebRenderer |
(an approach used in previous releases) displays a |
deprecation notice in the JS console. For more information, |
check out Customizing web app initialization.<topic_end> |
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