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JavaScript shells

A JavaScript shell allows you to quickly test snippets of JavaScript code without having to reload a web page. They are extremely useful for developing and debugging code.
Extensions JavaScript Tools

EXT_shader_texture_lod

The EXT_shader_texture_lod extension is part of the WebGL API and adds additional texture functions to the OpenGL ES Shading Language which provide the shader writer with explicit control of LOD (Level of detail).
API Reference WebGL WebGL extensions

WEBGL_compressed_texture_atc

The WEBGL_compressed_texture_atc extension is part of the WebGL API and exposes 3 ATC compressed texture formats. ATC is a proprietary compression algorithm for compressing textures on handheld devices.
API Reference WebGL WebGL extensions

Mozilla CSS Extensions

Mozilla supports a number of extensions to CSS that are prefixed with -moz-.
CSS CSS Reference CSS:Mozilla Extensions

-moz-text-blink

The -moz-text-blink non-standard Mozilla CSS extension specifies the blink mode.
CSS CSS Reference CSS:Mozilla Extensions

-moz-float-edge

The non-standard -moz-float-edge CSS property specifies whether the height and width properties of the element include the margin, border, or padding thickness.
CSS CSS Property CSS:Mozilla Extensions Layout NeedsCompatTable Non-standard

-moz-user-focus

The -moz-user-focus CSS property is used to indicate whether the element can have the focus.
CSS CSS Reference CSS:Mozilla Extensions NeedsBrowserCompatibility NeedsContent NeedsExample NeedsMobileBrowserCompatibility

HTMLMediaElement.seekable

The seekable read-only property of the HTMLMediaElement returns a TimeRanges object that contains the time ranges that the user is able to seek to, if any.
API Audio Extensions HTMLMediaElement Media MSE Property Reference seekable source Source Video

MediaSource.addSourceBuffer()

The addSourceBuffer() method of the MediaSource interface creates a new SourceBuffer of the given MIME type and adds it to the MediaSource's SourceBuffers list.
addSourceBuffer API Audio Experimental Media Source Extensions MediaSource Method MSE Reference Video