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HTML allows you to specify colors using different methods. Here are some common ways to define colors in HTML:

1. Named Colors: HTML supports a set of predefined color names that you can use directly. For example:

<p style="color: red;">This text is red.</p>
<p style="background-color: skyblue;">This has a sky blue background.</p>

2. Hexadecimal Notation: Colors can be specified using a six-digit hexadecimal value representing the RGB (red, green, blue) color model. Each pair of digits represents the intensity of each color component. For example:

<p style="color: #FF0000;">This text is red.</p>
<p style="background-color: #00FF00;">This has a green background.</p>

3. RGB Notation: Colors can be specified using the RGB color model by specifying the intensity of the red, green, and blue components using integer values ranging from 0 to 255. For example:

<p style="color: rgb(255, 0, 0);">This text is red.</p>
<p style="background-color: rgb(0, 255, 0);">This has a green background.</p>

4. RGBA Notation: RGBA is similar to RGB but includes an additional alpha channel that specifies the opacity or transparency of the color. The alpha value ranges from 0 (completely transparent) to 1 (completely opaque). For example:

<p style="color: rgba(255, 0, 0, 0.5);">This text is red with 50% transparency.</p>
<p style="background-color: rgba(0, 255, 0, 0.7);">This has a green background with 70% transparency.</p>

5. HSL Notation: Colors can be specified using the HSL (hue, saturation, lightness) color model. The hue value represents the color, saturation represents the intensity, and lightness represents the brightness. For example:

<p style="color: hsl(0, 100%, 50%);">This text is red.</p>
<p style="background-color: hsl(120, 100%, 50%);">This has a green background.</p>

6. HSLA Notation: HSLA is similar to HSL but includes an additional alpha channel for transparency. The alpha value ranges from 0 (completely transparent) to 1 (completely opaque). For example:

<p style="color: hsla(0, 100%, 50%, 0.5);">This text is red with 50% transparency.</p>
<p style="background-color: hsla(120, 100%, 50%, 0.7);">This has a green background with 70% transparency.</p>

These are some of the commonly used methods for specifying colors in HTML. You can choose the method that best suits your needs and preferences to add color to your HTML elements and enhance the visual appearance of your web pages.