All questions of HTML Media for Class 3 Exam

Supported Protocols by Android Browsers

Android browsers support multiple protocols that allow users to access and interact with various websites and online services. Among the protocols commonly supported by Android browsers are HTTPS, HLS, RTMP, and FTP. However, the correct answer to this question is HLSc, which stands for HTTP Live Streaming.

HTTP Live Streaming (HLS)
HTTP Live Streaming is a protocol developed by Apple for delivering media content, such as audio and video, over the internet. It is widely adopted and supported by various platforms, including Android browsers. HLS breaks the media content into small chunks and streams them over HTTP. This allows the content to be delivered efficiently and adaptively according to the network conditions and device capabilities.

Advantages of HLS
- Adaptive Streaming: HLS supports adaptive streaming, meaning it can dynamically adjust the quality of the media stream based on the user's network conditions. This ensures a smooth playback experience even in varying network conditions.
- Compatibility: HLS is widely compatible with different devices and platforms, including Android browsers. This makes it an ideal choice for delivering media content to a broad range of users.
- Security: HLS supports encryption and content protection mechanisms, such as HTTPS, which ensures the privacy and security of the media content being streamed.
- Seamless Switching: HLS allows for seamless switching between different quality levels or bitrates during playback. This ensures that the media playback remains uninterrupted and adjusts to the user's device capabilities and network conditions.

Other Supported Protocols
While HLS is the correct answer for this question, it's important to note that Android browsers also support other protocols, which are briefly explained below:

- HTTPS (Hypertext Transfer Protocol Secure): HTTPS is the secure version of HTTP and is widely used for secure communication over the internet. It encrypts the data being transmitted, ensuring privacy and security.
- RTMP (Real-Time Messaging Protocol): RTMP is a protocol primarily used for live streaming of audio and video content. Although it was widely supported in the past, some Android browsers may not fully support RTMP due to security and performance concerns.
- FTP (File Transfer Protocol): FTP is a protocol used for transferring files over the internet. While Android browsers may not directly support FTP, there are dedicated FTP client apps available on the Play Store that can be used to access FTP servers.

In conclusion, Android browsers support various protocols, including HTTPS, HLS, RTMP, and FTP. However, the correct answer to the question is HLS, as it is a widely supported protocol for streaming media content on Android devices.

Source

Internet Explorer does not support the WAV file format.

HTML bullet points:
- Overview of Internet Explorer
- Explanation of the WAV file format

Internet Explorer overview:
Internet Explorer is a web browser developed by Microsoft and was once one of the most widely used browsers. It was the default browser for Windows operating systems until it was replaced by Microsoft Edge. Internet Explorer supports various file formats for multimedia content, such as images, videos, and audio files.

Explanation of the WAV file format:
The WAV (Waveform Audio File Format) is an audio file format developed by Microsoft and IBM. It is widely used for storing audio data on Windows systems. WAV files are typically uncompressed, which means they can be of high quality but also take up more storage space compared to compressed audio formats like MP3.

Reason why Internet Explorer does not support WAV files:
While Internet Explorer supports various multimedia file formats, it does not support the WAV file format. This could be due to several reasons:

1. Compatibility: Internet Explorer focuses on providing compatibility with a wide range of web standards and file formats. However, it may not support certain file formats that are less commonly used or have been replaced by newer formats.

2. Limited audio support: Internet Explorer may have limited support for certain audio formats, and WAV may not be included in its list of supported formats. This could be a deliberate decision by Microsoft to prioritize other audio formats that are more commonly used on the web.

3. Alternative formats: Internet Explorer may suggest alternative audio formats that are more widely supported, such as MP3 or AAC. These formats offer good audio quality and smaller file sizes, making them more suitable for web-based applications.

Overall, while Internet Explorer has been a popular browser, it does not support the WAV file format. Users who encounter WAV files while browsing the web may need to use alternative browsers like Opera, Firefox, or Chrome, which do support this audio format.

Data Binding Attribute in HTML

The data binding attribute is used to bind data from the data source to an HTML element. This binding is done in a way that if the data is changed in the data source, it will automatically update the HTML element. The attribute used for data binding is "datasrc".

Syntax:



The data source can be a database, an XML file, or any other data source. The data binding attribute is used to link the HTML element to the data source.

Example:

Suppose you have a database that contains a list of users and their email addresses. You want to display this list on your webpage. You can use the data binding attribute to do this.

First, create a connection to the database using server-side scripting like PHP. Then, create an HTML table and use the data binding attribute to bind the data to the table.

HTML code:

Name	Email

In the above code, the "datasrc" attribute is used to specify the data source which is a PHP file that retrieves data from the database. The "datafld" attribute is used to specify which field from the data source should be displayed in the HTML table.

Conclusion

In conclusion, the data binding attribute "datasrc" is used to bind data from a data source to an HTML element. It is used to link the HTML element to the data source and automatically updates the HTML element when the data in the data source changes.

Explanation:
The correct answer is option 'D', which is "images".

HTML Object Tag:
The HTML object tag is used to embed multimedia (such as audio, video, Java applets, etc.) into an HTML document. It allows you to include external content or media within your web page.

Embedding Multimedia:
The object tag is primarily used to embed multimedia content like audio, video, or Java applets. It provides a way to include external files or media directly into an HTML document.

Options:
Let's analyze each option to understand why 'images' is the correct answer:

a) Audio:
The object tag can be used to embed audio files into an HTML document. You can specify the source of the audio file using the 'data' attribute within the object tag. Therefore, the option 'audio' is incorrect.

b) Video:
Similar to audio, the object tag can also be used to embed video files into an HTML document. You can specify the source of the video file using the 'data' attribute within the object tag. Therefore, the option 'video' is incorrect.

c) Java Applets:
The object tag can be used to embed Java applets into an HTML document. Java applets are small programs written in the Java programming language that can be embedded and run within a web page. Therefore, the option 'Java applets' is incorrect.

d) Images:
The object tag is not suitable for embedding images into an HTML document. Instead, the 'img' tag is specifically designed for displaying images. The 'img' tag allows you to specify the source of the image using the 'src' attribute. Therefore, the option 'images' is correct.

Conclusion:
The object tag in HTML is used to embed multimedia content like audio, video, or Java applets. However, it is not suitable for embedding images. To embed images, the 'img' tag should be used.

Understanding Browser-Specific Functions
When dealing with browser-specific functions, particularly in the context of Netscape Plugin API (NPAPI), it’s crucial to understand the prefixes associated with these functions.
The Correct Prefix: NPN
- The prefix NPN stands for Netscape Plugin API Native. It is used to denote functions that are part of the NPAPI, which allows plugins to interact with the web browser.
- NPP refers to the Plugin instance, and while it is important, it is not a prefix for functions but rather an object representing the plugin itself.
- UPP and GPN are not commonly used prefixes in the context of browser-specific functions related to NPAPI.
Why NPN is Significant
- Functionality: The NPN prefix is essential as it provides a set of functions that plugins can call to interact with the browser, such as rendering content, handling events, or managing memory.
- Standardization: Using the NPN prefix helps standardize the API calls across different browsers that support NPAPI plugins, making it easier for developers to implement cross-browser compatibility.
Conclusion
In summary, the prefix NPN is critical for identifying and utilizing browser-specific functions within the NPAPI framework. Understanding this prefix aids in effective plugin development and ensures seamless integration with web browsers.