Learn HTML Basic to Advanced: HTML

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elo 2026 · mfoundation

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From Basics to Advanced HTML5 — A Comprehensive Guide

Learn HTML the right way — from your very first webpage to advanced HTML5 features used by professional web developers today.

This complete, 32-chapter HTML course is designed for absolute beginners, students, and self-taught developers who want a structured, in-depth guide to HTML and HTML5, the foundational language behind every website on the internet.

What you'll learn:

• HTML fundamentals: document structure, tags, elements, and attributes

• Text formatting, links, images, lists, and tables

• HTML forms and input elements, including HTML5 validation

• Semantic HTML5 elements for clean, accessible markup

• Multimedia: audio, video, canvas, and SVG graphics

• Web accessibility (a11y) and ARIA best practices

• SEO fundamentals and meta tags for search visibility

• Responsive web design and mobile-friendly HTML

• Structured data, schema.org, and JSON-LD for rich search results

• Web Components: custom elements, shadow DOM, and templates

• Progressive Web Apps (PWA) and the web app manifest

• Internationalization, HTML email, and professional coding standards

Every chapter includes clear explanations and complete, ready-to-use HTML code examples. A full course index and quick-reference cheat sheet make this book easy to navigate, whether you're learning HTML for the first time or using it as a professional reference.

Perfect for beginner web developers, computer science students, coding bootcamp learners, front-end developers, and anyone preparing to learn CSS, JavaScript, or frameworks like React with a strong HTML foundation first.

From Basics to Advanced HTML5 — A Comprehensive Guide Learn HTML the right way — from your very first webpage to advanced HTML5 features used by professional web developers today. This complete, 32-chapter HTML course is designed for absolute beginners, students, and self-taught developers who ...

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aunching lib\main.dart on Infinix X6857B in debug mode...

Warning: Flutter support for your project's Gradle version (8.12.0) will soon be dropped. Please upgrade your Gradle version to a version of at least 8.14.0 soon.

Alternatively, use the flag "--android-skip-build-dependency-validation" to bypass this check.

Potential fix: Your project's gradle version is typically defined in the gradle wrapper file. By default, this can be found at C:\Myassets\Atextandreserach\qr app\qr2\android/gradle/wrapper/gradle-wrapper.properties.

For more information, see https://docs.gradle.org/current/userguide/gradle_wrapper.html.

Warning: Flutter support for your project's Android Gradle Plugin version (Android Gradle Plugin version 8.7.3) will soon be dropped. Please upgrade your Android Gradle Plugin version to a version of at least Android Gradle Plugin version 8.11.1 soon.

Alternatively, use the flag "--android-skip-build-dependency-validation" to bypass this check.

Potential fix: Your project's AGP version is typically defined in the plugins block of the `settings.gradle` file (C:\Myassets\Atextandreserach\qr app\qr2\android/settings.gradle), by a plugin with the id of com.android.application.

If you don't see a plugins block, your project was likely created with an older template version. In this case it is most likely defined in the top-level build.gradle file (C:\Myassets\Atextandreserach\qr app\qr2\android/build.gradle) by the following line in the dependencies block of the buildscript: "classpath 'com.android.tools.build:gradle:<version>'".

Warning: Flutter support for your project's Kotlin version (2.1.0) will soon be dropped. Please upgrade your Kotlin version to a version of at least 2.2.20 soon.

Alternatively, use the flag "--android-skip-build-dependency-validation" to bypass this check.

Potential fix: Your project's KGP version is typically defined in the plugins block of the `settings.gradle` file (C:\Myassets\Atextandreserach\qr app\qr2\android/settings.gradle), by a plugin with the id of org.jetbrains.kotlin.android.

If you don't see a plugins block, your project was likely created with an older template version, in which case it is most likely defined in the top-level build.gradle file (C:\Myassets\Atextandreserach\qr app\qr2\android/build.gradle) by the ext.kotlin_version property.

e: Daemon compilation failed: null

java.lang.Exception

at org.jetbrains.kotlin.daemon.common.CompileService$CallResult$Error.get(CompileService.kt:69)

at org.jetbrains.kotlin.daemon.common.CompileService$CallResult$Error.get(CompileService.kt:65)

at org.jetbrains.kotlin.compilerRunner.GradleKotlinCompilerWork.compileWithDaemon(GradleKotlinCompilerWork.kt:240)

at org.jetbrains.kotlin.compilerRunner.GradleKotlinCompilerWork.compileWithDaemonOrFallbackImpl(GradleKotlinCompilerWork.kt:159)

at org.jetbrains.kotlin.compilerRunner.GradleKotlinCompilerWork.run(GradleKotlinCompilerWork.kt:111)

at org.jetbrains.kotlin.compilerRunner.GradleCompilerRunnerWithWorkers$GradleKotlinCompilerWorkAction.execute(GradleCompilerRunnerWithWorkers.kt:76)

at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:63)

at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.create(NoIsolationWorkerFactory.java:66)

at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.create(NoIsolationWorkerFactory.java:62)

at org.gradle.internal.classloader.ClassLoaderUtils.executeInClassloader(ClassLoaderUtils.java:100)

at org.gradle.workers.internal.NoIsolationWorkerFactory$1.lambda$execute$0(NoIsolationWorkerFactory.java:62)

at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:44)

at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:41)

at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:209)

at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)

at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)

at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)

at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:166)

at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)

at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)

at org.gradle.workers.internal.AbstractWorker.executeWrappedInBuildOperation(AbstractWorker.java:41)

at org.gradle.workers.internal.NoIsolationWorkerFactory$1.execute(NoIsolationWorkerFactory.java:59)

at org.gradle.workers.internal.DefaultWorkerExecutor.lambda$submitWork$0(DefaultWorkerExecutor.java:174)

at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)

at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runExecution(DefaultConditionalExecutionQueue.java:194)

at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.access$700(DefaultConditionalExecutionQueue.java:127)

at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner$1.run(DefaultConditionalExecutionQueue.java:169)

at org.gradle.internal.Factories$1.create(Factories.java:31)

at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:263)

at org.gradle.internal.work.DefaultWorkerLeaseService.runAsWorkerThread(DefaultWorkerLeaseService.java:127)

at org.gradle.internal.work.DefaultWorkerLeaseService.runAsWorkerThread(DefaultWorkerLeaseService.java:132)

at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runBatch(DefaultConditionalExecutionQueue.java:164)

at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.run(DefaultConditionalExecutionQueue.java:133)

at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)

at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)

at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)

at org.gradle.internal.concurrent.AbstractManagedExecutor$1.run(AbstractManagedExecutor.java:48)

at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)

at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)

at java.base/java.lang.Thread.run(Thread.java:840)

Caused by: java.lang.AssertionError: java.lang.Exception: Could not close incremental caches in C:\Myassets\Atextandreserach\qr app\qr2\build\file_picker\kotlin\compileDebugKotlin\cacheable\caches-jvm\jvm\kotlin: class-attributes.tab

at org.jetbrains.kotlin.com.google.common.io.Closer.close(Closer.java:236)

at org.jetbrains.kotlin.incremental.IncrementalCachesManager.close(IncrementalCachesManager.kt:55)

at kotlin.io.CloseableKt.closeFinally(Closeable.kt:56)

at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:293)

at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:129)

at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:674)

at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:91)

at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1659)

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)

at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.base/java.lang.reflect.Method.invoke(Method.java:569)

at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:360)

at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)

at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)

at java.base/java.security.AccessController.doPrivileged(AccessController.java:712)

at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)

at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:587)

at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)

at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:705)

at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)

at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704)

... 3 more

Caused by: java.lang.Exception: Could not close incremental caches in C:\Myassets\Atextandreserach\qr app\qr2\build\file_picker\kotlin\compileDebugKotlin\cacheable\caches-jvm\jvm\kotlin: class-attributes.tab

at org.jetbrains.kotlin.incremental.storage.BasicMapsOwner.forEachMapSafe(BasicMapsOwner.kt:95)

at org.jetbrains.kotlin.incremental.storage.BasicMapsOwner.close(BasicMapsOwner.kt:53)

at org.jetbrains.kotlin.com.google.common.io.Closer.close(Closer.java:223)

... 24 more

Suppressed: java.lang.IllegalStateException: Storage for [C:\Myassets\Atextandreserach\qr app\qr2\build\file_picker\kotlin\compileDebugKotlin\cacheable\caches-jvm\jvm\kotlin\class-attributes.tab] is already registered

at org.jetbrains.kotlin.com.intellij.util.io.FilePageCache.registerPagedFileStorage(FilePageCache.java:410)

at org.jetbrains.kotlin.com.intellij.util.io.PagedFileStorage.<init>(PagedFileStorage.java:72)

at org.jetbrains.kotlin.com.intellij.util.io.ResizeableMappedFile.<init>(ResizeableMappedFile.java:55)

at org.jetbrains.kotlin.com.intellij.util.io.PersistentBTreeEnumerator.<init>(PersistentBTreeEnumerator.java:128)

at org.jetbrains.kotlin.com.intellij.util.io.PersistentEnumerator.createDefaultEnumerator(PersistentEnumerator.java:52)

at org.jetbrains.kotlin.com.intellij.util.io.PersistentMapImpl.<init>(PersistentMapImpl.java:165)

at org.jetbrains.kotlin.com.intellij.util.io.PersistentMapImpl.<init>(PersistentMapImpl.java:140)

at org.jetbrains.kotlin.com.intellij.util.io.PersistentMapBuilder.buildImplementation(PersistentMapBuilder.java:88)

at org.jetbrains.kotlin.com.intellij.util.io.PersistentMapBuilder.build(PersistentMapBuilder.java:71)

at org.jetbrains.kotlin.com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:45)

at org.jetbrains.kotlin.com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:71)

at org.jetbrains.kotlin.incremental.storage.LazyStorage.createMap(LazyStorage.kt:62)

at org.jetbrains.kotlin.incremental.storage.LazyStorage.getStorageOrCreateNew(LazyStorage.kt:59)

at org.jetbrains.kotlin.incremental.storage.LazyStorage.set(LazyStorage.kt:80)

at org.jetbrains.kotlin.incremental.storage.InMemoryStorage.applyChanges(InMemoryStorage.kt:108)

at org.jetbrains.kotlin.incremental.storage.InMemoryStorage.close(InMemoryStorage.kt:136)

at org.jetbrains.kotlin.incremental.storage.PersistentStorageWrapper.close(PersistentStorage.kt:124)

at org.jetbrains.kotlin.incremental.storage.BasicMapsOwner$close$1.invoke(BasicMapsOwner.kt:53)

at org.jetbrains.kotlin.incremental.storage.BasicMapsOwner.forEachMapSafe(BasicMapsOwner.kt:87)

... 26 more

Suppressed: java.lang.Exception: Storage[C:\Myassets\Atextandreserach\qr app\qr2\build\file_picker\kotlin\compileDebugKotlin\cacheable\caches-jvm\jvm\kotlin\class-attributes.tab] registration stack trace

at org.jetbrains.kotlin.com.intellij.util.io.FilePageCache.registerPagedFileStorage(FilePageCache.java:437)

... 45 more

Suppressed: java.lang.Exception: Could not close incremental caches in C:\Myassets\Atextandreserach\qr app\qr2\build\file_picker\kotlin\compileDebugKotlin\cacheable\caches-jvm\inputs: source-to-output.tab

... 27 more