How Can I Maintain a Constant Font Size Relative to a Dynamic Container's Dimensions?

Achieving Constant Font Size Relative to Container Dimensions

When working with containers whose dimensions fluctuate based on external factors, setting the font size to maintain a consistent size relative to the container can pose a challenge. By utilizing CSS, you can overcome this hurdle and achieve your desired result.

Embracing Viewport Width Units: vw

To determine the font size as a percentage of the viewport width, employ the vwunit. For instance:

#mydiv {
  font-size: 5vw;
}

In this example, the font size of #mydiv will always be 5% of the viewport width, regardless of the container's size.

Leveraging Embedded SVG

If you prefer a different approach, consider incorporating embedded SVG within your HTML. Use the font-size attribute to define the size of the text element in "user units," aligning it with the dimensions of the viewport. For example:

<svg viewBox="0 0 100 100">
  <text font-size="1">...</text>
</svg>

Within this SVG, a font size of 1 will equate to one-hundredth the size of the SVG element.

Limitations of CSS Calculations

It is important to note that CSS calculations cannot be used to set the font size as a percentage of the container size. This restriction stems from the fact that percentages in font-size calculations are interpreted relative to the inherited font size, not the container's dimensions. While a unit like bw (box-width) would facilitate such functionality, it is yet to be proposed in CSS.

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