Is it possible to allow users to choose the font size for the entire application, offering three options: Big, Medium, Small? If a user selects "Big", all fonts in the application will be resized globally. I have spent time researching this issue but have yet to find a solution to resize all fonts across the board (for instance, when selecting "Big", every font would increase in size by x times).
To ensure consistency in font sizes across your website, start by setting the font-size for the html tag. Then, for other selectors, use font-size with either rem or em units. Personally, I prefer using rem. The rem unit is calculated based on the html font size.
Once you have established this baseline, you can easily adjust the font size of the html tag by adding specific classes.
In my opinion, a simple solution to achieve this is by establishing a pixel-based font size for the body element and utilizing the em unit for other elements. This way, their font sizes will be proportional to that of the body element.
Additionally, you can insert buttons that adjust the font size of the body element through JavaScript when clicked. The font sizes of elements using em values will automatically adapt accordingly.
Here are some suggestions to adjust the font size:
CSS
:root {
--font-size: 20px;
}
div {
font-size: var(--font-size);
}
JS
document.documentElement.style.setProperty('--font-size', '16px');
An alternative approach would be to set the font size on the html element and use em units for referencing it:
html {
font-size: 16px;
}
html.big {
font-size: 20px;
}
div {
font-size: 1em;
}
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