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• Adding z-index

  The first example, Stacking without z-index, explains how stacking is arranged by default. If you want to specify a different stacking order, you have to position an element and use the z-index property.

  developer.mozilla.org/en-US/docs/Web/CSS/CSS_Positioning/Understanding_z_index/Adding_z-index

• DirectoryEntrySync

  The DirectoryEntrySync interface of the File System API represents a directory in a file system. It includes methods for creating, reading, looking up, and recursively removing files in a directory.

  developer.mozilla.org/en-US/docs/Web/API/DirectoryEntrySync

• Using the alertdialog role

  The alertdialog role is used to notify the user of urgent information that demands the user's immediate attention. As the name implies, alertdialog is a type of dialog. This means that most of the instructions provided in the ' using the dialog role ' technique are applicable to the alertdialog role as well:

  developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Techniques/Using_the_alertdialog_role

• KeyboardEvent.which

  The KeyboardEvent.which read-only property returns the numeric keyCode of the key pressed, or the character code (charCode) for an alphanumeric key pressed.

  developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/which

• Deprecated and obsolete features

  This page lists features of JavaScript that are deprecated (that is, still available but planned for removal) and obsolete (that is, no longer usable).

  developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Deprecated_and_obsolete_features

• Int8Array

  The Int8Array typed array represents an array of twos-complement 8-bit signed integers. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).

  developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Int8Array

• Uint32Array

  The Uint32Array typed array represents an array of 32-bit unsigned integers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).

  developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint32Array

• Object.prototype.toSource()

  The toSource() method returns a string representing the source code of the object.

  developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toSource

• <sup>

  The HTML Superscript Element (sup) defines a span of text that should be displayed, for typographic reasons, higher, and often smaller, than the main span of text.

  developer.mozilla.org/en-US/docs/Web/HTML/Element/sup

• <thead>

  The HTML Table Head Element (thead) defines a set of rows defining the head of the columns of the table.

  developer.mozilla.org/en-US/docs/Web/HTML/Element/thead