HTML5提供了一些新的元素和屬性

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Google Inc. has announced a larger version of its Nexus tablet computer, one that comes closer to competing with Apple's full-sized iPad and other tablets. Here's a look at how the Nexus 10 compares with other tablets with comparable screens.

Google Inc.'s Nexus 10 (available Nov. 13):

— Price: $399 for 16 gigabytes of storage, $499 for 32 GB

— Screen size: 10.1 inches diagonally

— Screen resolution: 2560 by 1600 pixels

— Weight: 1.33 pounds.

— Cameras: 5-megapixel camera on back and a low-resolution camera on front, for videoconferencing

— Battery life: 9 hours for video playback, 7 hours for Web browsing.

— Operating system: Google's Android

Pros: Access to a variety of games, utilities and other software for Android devices, though not as extensive as apps available for iPad. Cheaper than newest full-sized iPad.

Cons: Integrates with Google Play store, which is still new and isn't as robust as Apple or Amazon's stores. Data storage cannot be expanded with memory cards. No option for cellular wireless broadband.

Apple Inc.'s iPad:

— Price: Starts at $499 for 16 gigabytes of storage, goes up to $699 for 64 gigabytes, more for versions with cellular data access. (Apple still sells the older, iPad 2 for $399.)

— Screen size: 9.7 inches diagonally

— Screen resolution: 2048 by 1536 pixels

— Weight: 1.44 pounds

— Cameras: 5-megapixel camera on back and a low-resolution camera on front, for videoconferencing

— Battery life: 10 hours.

— Operating system: Apple's iOS

Pros: Unmatched access to third-party applications, high-quality Apple software and the iTunes store. Unique high-resolution screen. Widest range of cases and accessories available. Available with access to fast 4G wireless broadband networks, starting at $629.

Cons: Data storage cannot be expanded with memory cards.

Amazon.com Inc.'s Kindle Fire HD 8.9" (available Nov. 20):

— Price: $299 for 16 gigabytes of storage, $369 for 32 GB.

— Screen size: 8.9 inches diagonally

— Screen resolution: 1920 by 1200 pixels

— Weight: 1.25 pounds.

— Cameras: Front-facing camera.

— Battery life: Undisclosed.

— Operating system: Modified version of Google's Android

Pros: Cheap and portable. Convenient access to Amazon store. Large high-definition screen. Dolby audio. Available with access to fast 4G wireless broadband networks, for $499.

Cons: Small selection of third-party applications available from Amazon. No rear camera for taking video and photos.

Samsung Electronic Co.'s Galaxy Tab 2 10.1:

— Price: $399 for 16 gigabytes of storage

— Screen size: 10.1 inches diagonally

— Screen resolution: 1280 by 800 pixels

— Weight: 1.24 pounds

— Cameras: low-resolution front camera, 3-megapixel back.

— Battery life: 11 hours.

— Operating system: Google's Android

Pros: Also with 7-inch screen for $250. Storage is expandable with microSD memory cards. Can act as a universal remote control for an entertainment center.

Cons: Selection of third-party applications not as good as iPad's, but wider than Kindle. Screen resolution lower than iPad's. No option yet for wireless broadband, though one is expected soon.

Samsung Electronic Co.'s Galaxy Note 10.1:

— Price: $499 for 16 gigabytes of storage, $549 for 32 GB

— Screen size: 10.1 inches diagonally

— Screen resolution: 1280 by 800 pixels

— Weight: 1.3 pounds

— Cameras: low-resolution front camera, 5-megapixel back.

— Battery life: 9 hours.

— Operating system: Google's Android

Pros: Comes with a pen, for jotting notes and drawing on the screen. Slightly thinner and lighter than an iPad. Longer, narrower screen better suited to movies. Storage is expandable with microSDmemory cards. Can act as a universal remote control for an entertainment center.

Cons: Selection of third-party applications not as good as iPad's, but wider than Kindle. Screen resolution lower than iPad's. No option for wireless broadband. Pen sensor slightly shortens battery life.

Barnes & Noble Inc.'s Nook HD+ (available Thursday):

— Price: $269 for 16 gigabytes of storage; $299 for 32 GB

— Screen size: 9 inches diagonally

— Screen resolution: 1920 x 1280 pixels

— Weight: 1.14 pounds

— Cameras: None.

— Battery life: 10 hours of reading, 9 hours of video

— Operating system: Modified version of Google's Android

Pros: Cheap and portable. Storage is expandable with microSD memory cards. Easy access to Barnes & Noble book store.

Cons: Selection of third-party applications is small. Barnes & Noble lacks wide range of content. Lacks cameras and option for wireless broadband.