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      When this extension is enabled:
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      When this extension is enabled:
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      <ul>
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      <ul>
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      <li> The <code>hint</code> entry point accepts <code>FRAGMENT_SHADER_DERIVATIVE_HINT_OES</code>
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      <li> The <code>hint</code> entry point accepts <code>FRAGMENT_SHADER_DERIVATIVE_HINT_OES</code>
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           as a target.
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           as a target and the <code>getParameter</code> entry point accepts it as a pname.
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      <li> The built-in functions <code>dFdx()</code>, <code>dFdy()</code>, and <code>fwidth()</code>
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      <li> The built-in functions <code>dFdx()</code>, <code>dFdy()</code>, and <code>fwidth()</code>
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           are available in fragment shaders if the following directive is added to the shader:
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           are available in fragment shaders if the following directive is added to the shader:
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<pre>
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<pre>

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