Sizing text with CSS can be done in several ways, each with its own unique benefits and use cases. The most basic way is to use the font-size property.
You can specify a font size in pixels, points, or ems, with pixels being the most common unit. For example, font-size: 16px; sets the font size to 16 pixels.
Using relative units like ems or percentages allows for more flexibility and easier maintenance of your CSS code. For instance, font-size: 1.5em; makes the text 1.5 times the size of the parent element's font size.
In the article, we'll explore more advanced techniques, such as using the rem unit and the font-size property in combination with other CSS properties.
CSS Text Sizing
CSS text sizing is a crucial aspect of web design, and there are several ways to achieve it. Using pixels (px) is one way to specify font size, but it's not the most flexible approach.
For example, using ems can be more effective, as it allows the font size to inherit the parent element's font size. In fact, 1em is equal to the parent element's font size, which is usually 16px by default. This means that if you set a font size of 1em, it will be the same as the parent element's font size.
To set relative font sizes, use rem units, which maintain the proportions between all font sizes. This is particularly useful for responsive design, as it ensures that text looks good regardless of the screen size.
Here are some common font size units and their uses:
- px: Absolute font size in pixels
- em: Relative font size that inherits the parent element's font size
- rem: Relative font size that is relative to the base font size (set using rem units)
These units can be used in combination with CSS media queries to create responsive font sizes that adapt to different screen sizes and orientations.
CSS Sizing Example
Using ems, you can set font sizes relative to their parent elements. This means if you set a font size to 1em, it will be the same as the parent element's font size.
If you haven't set a font size for a parent element, the browser will use the default value, usually 16px. This is why 1em is by default 16px, and 2em is by default 32px.
To set the font size of all paragraphs to 16px, you would use 1em. This is because 1em is equal to the default font size of 16px. You can also set the font size of headings to a specific size, like 24px, by using 1.5em.
Suppose you want all headings to appear with a font size of 24px. You would use 1.5em, which is equal to 24px. This way, all headings will have the same font size, regardless of their position in the document.
If you set the font size of a heading to 1.5em, it will inherit the font size of its parent element. This means if the parent element has a font size of 20px, the heading will appear with a font size of 30px (1.5em x 20px).
Consider reading: Html Text Element
CSS Locks
CSS Locks can be a game-changer for responsive text sizing. They're based on the viewport dimensions, making them perfect for scaling text proportionally.
Using units like vw and vh, you can set the base font size to a percentage of the viewport width or height. For example, setting the base font size to 4% of the viewport width makes text size scale proportionally as the viewport gets larger or smaller.
Lock units work great for heading sizes too, allowing you to set headings that scale nicely with the rest of your content.
Setting Text Size
Setting text size is a crucial aspect of web design, and there are several ways to do it in CSS. You can use pixels, which is a good unit of measurement because it allows you to be precise and is largely unaffected by operating systems or web browsers.
However, using pixels to set the size of a font in a block of text does have one limitation: accessibility. Visually impaired users may struggle to use a site that uses pixels to define font sizes.
One common alternative is to use ems, which refer to the font size of a parent element. If you set a font's size to 2em, the font size will be twice that of the parent element.
Using ems can be especially useful when you want to set the size of a font relative to its parent element. For example, if the parent element has a font size of 20px, setting the font size of a child element to 1em will make it 20px as well.
Here are some common absolute keywords you can use to set the size of a font in CSS: xx-small (9px)x-small (10px)small (13px)medium (16px)large (18px)x-large (24px)xx-large (32px)
You can also use relative keywords like smaller and larger to set font sizes that will change depending on the font sizing elsewhere on the page. These keywords are useful because they allow you to change the size of your fonts as other font sizes on the page change.
Using rem units is another way to specify relative font sizes, especially when using responsive design. This will maintain the proportions between all font sizes so they always look good.
On a similar theme: Html Small Text
Text Size Units
There are several text size units in CSS, each with its own unique characteristics.
The em unit is a relative unit based on the computed value of the font size of the parent element, which means child elements are always dependent on their parent to set their font-size.
The rem unit, on the other hand, is dependent on the value of the root element (or the html element), making it useful for responsive scaling.
Here are some common text size units, along with their characteristics:
The ch unit, for example, sets the font-size of an element in relation to the width of the 0 (zero) glyph of the font.
Set Ems
Setting font sizes using ems is a common way to style text in CSS. The em unit of measurement refers to the font size of a parent element.
If you set a font's size to 1em, it will be the same as the parent element's font size. This is because em values inherit the font size of their parents.
In a web page, the default font size is usually 16px, which means 1em is by default 16px. So, if you set the font size to 1em, it will be 16px.
You can use ems to set font sizes for specific elements, like headings and paragraphs. For example, setting a heading to 1.5em will make it 24px.
Ems can also be used to create a hierarchy of font sizes on a web page. By setting different font sizes for different elements, you can control the size of text on your page.
The Em Unit
The em unit is a relative unit based on the computed value of the font size of the parent element. This means that child elements are always dependent on their parent to set their font-size.
For example, if you have a paragraph of text stored in a box with a font size of 20px, and you specify the font size of the paragraph to be 1em, the font size of the paragraph will be 20px. This is the same as the parent element's font size.
For more insights, see: How to Edit Text Html in Paragraph Tab
The em unit can be useful for scaling type up depending on the font-size of the parent element. For instance, if you have a heading that is 2 times the font size of its parent, it will be 32px, because 2 x 16 = 32px.
Here are some examples of how the em unit works:
As you can see, the em unit is relative to the parent element's font size, so the size of the child element will change depending on the parent's font size.
The CH Unit
The CH unit is a unique way to set font sizes in CSS. It's similar to the ex unit, but instead of relating to the x-height of a font, it relates to the width of the 0 (zero) glyph.
The CH unit is supported by most modern browsers, including Chrome 27+, Safari, Firefox 10+, and Opera. It's also supported by Android and iOS devices.
Here's a quick rundown of browser support for the CH unit:
The CH unit is a useful addition to your CSS toolkit, especially when you need to set font sizes in relation to the width of a specific glyph.
Baseline Widely Available
The baseline unit of measurement is widely available for use in digital design.
The baseline is 1/2 the height of the x-height, which is a common measurement in typography.
In digital design, a baseline of 12 pixels is a common default setting.
This baseline provides a standard reference point for text size units, making it easier to create consistent designs.
Sources
- https://careerkarma.com/blog/css-font-size/
- https://css-tricks.com/almanac/properties/f/font-size/
- https://matthewjamestaylor.com/responsive-font-size
- https://medium.com/@sikirus81/how-to-scale-fonts-responsively-with-css-for-different-screen-sizes-4107f233988b
- https://developer.mozilla.org/en-US/docs/Web/CSS/font-size
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