HTML <sub> style Attribute

HTML <style>

HTML <summary>

A style attribute on a <sub> tag assigns a unique style to the element.

Its value is CSS that defines the appearance of the sub element.

Example

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A style attribute on a <sub> tag.

The formula for water is H₂O.

<p>
  The formula for water is 
  H<sub style="color:red;font-weight:bold;">2</sub>O.
</p>

Using style

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The style attribute specifies the style, i.e. look and feel, of the <sub> element.

A style contains any number of CSS property/value pairs, separated by semicolons (;).

The style attribute overrides any other style that was defined in a <style> tag or an external CSS file.

This inline styling affects the current <sub> element only.

Syntax

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<sub style="CSS-styles">

Values

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Value	Description
CSS-styles	One or more CSS property/value pairs separated by semicolons (;).

More Examples

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A style attribute on a <sub> tag.
Clicking the button toggles the text color.

The formula for water is H₂O.

<p>
  The formula for water is 
  H<sub id="mysub" style="color:red; font-weight:bold;">2</sub>O.
</p>

<br />
<button onclick="toggle();">Toggle style</button>

<script>
  let toggle = () => {
     let element = document.getElementById("mysub");

    if (element.style.color === "red") {
      element.style.color = "teal";
    } else {
      element.style.color = "red";
    }
  }
</script>

Code explanation

The style attribute assigns a text color to the <sub> element.

Clicking the button calls JavaScript which toggles the text color to another color.

Browser support

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Here is when style support started for each browser: