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<p>Alpha channel (Transparency) (<code>0-255</code>).</p>
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      <a href="#anchor_x-instance_method" title="#anchor_x (instance method)">#<strong>anchor_x</strong>  &#x21d2; Numeric </a>
    

    
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<p>Anchor X for rendering relative to width; default ‘nil` (same as 0.0).</p>