Min font size html

font-size

CSS Свойство font-size определяет размер шрифта. Это свойство также используется для вычисления размера em , ex и других относительных единиц. Подробнее: .

Интерактивный пример

Синтаксис

/* значения в */ font-size: xx-small; font-size: x-small; font-size: small; font-size: medium; font-size: large; font-size: x-large; font-size: xx-large; /* значения в */ font-size: larger; font-size: smaller; /* */ font-size: 12px; font-size: 0.8em; /* */ font-size: 80%; /* Глобальные значения */ font-size: inherit; font-size: initial; font-size: unset; 

Свойство font-size устанавливается одним из следующих способов:

• Ключевым словом из перечня абсолютных значений или относительных значений
• Как или , по отношению к размеру родительского элемента.

Значения

Набор ключевых слов абсолютных значений, по отношению к пользовательскому размеру шрифта по умолчанию (им считается medium — среднее).

Больше (larger) или меньше (smaller). Ключевые слова для относительного размера. Шрифт будет больше или меньше по отношению в размеру шрифта родительского элемента.Примерно на такое же соотношение, которое используется в ключевых словах абсолютного размера выше.

Примечание: Для обеспечения максимальной совместимости обычно лучше использовать значения, относящиеся к размеру шрифта пользователя по умолчанию.

Формальный синтаксис

font-size =
| (en-US)
| (en-US)
(en-US) | (en-US)
math

=
| (en-US)

Возможные подходы

Существуют разные способы задания размера шрифта. С помощью ключевых слов или с помощью числовых значений для размера пикселей или размера ems. Выберите подходящий метод в зависимости от потребностей конкретной веб-страницы.

Ключевые слова

Keywords are a good way to set the size of fonts on the web. By setting a keyword font size on the body element, you can set relative font-sizing everywhere else on the page, giving you the ability to easily scale the font up or down on the entire page accordingly.

Pixels

Setting the font size in pixel values ( px ) is a good choice when you need pixel accuracy. A px value is static. This is an OS-independent and cross-browser way of literally telling the browsers to render the letters at exactly the number of pixels in height that you specified. The results may vary slightly across browsers, as they may use different algorithms to achieve a similar effect.

Font sizing settings can also be used in combination. For example, if a parent element is set to 16px and its child element is set to larger , the child element displays larger than the parent element in the page.

Примечание: Defining font sizes in pixel is not accessible, because the user cannot change the font size from the browser. (For example, users with limited vision may wish to set the font size much larger than the size chosen by a web designer.) Therefore, avoid using pixels for font sizes if you wish to create an inclusive design.

Ems

Another way of setting the font size is with em values. The size of an em value is dynamic. When defining the font-size property, an em is equal to the size of the font that applies to the parent of the element in question. If you haven’t set the font size anywhere on the page, then it is the browser default, which is probably 16px. So, by default 1em = 16px, and 2em = 32px. If you set a font-size of 20px on the body element, then 1em = 20px and 2em = 40px. Note that the value 2 is essentially a multiplier of the current em size.

In order to calculate the em equivalent for any pixel value required, you can use this formula:

em = desired element pixel value / parent element font-size in pixels

For example, suppose the font-size of the body of the page is set to 1em, with the browser standard of 1em = 16px; if the font-size you want is 12px, then you should specify 0.75em (because 12/16 = 0.75). Similarly, if you want a font size of 10px, then specify 0.625em (10/16 = 0.625); for 22px, specify 1.375em (22/16).

A popular technique to use throughout the document is to set the the font-size of the body to 62.5% (that is 62.5% of the default of 16px), which equates to 10px, or 0.625em. Now you can set the font-size for any elements using em units, with an easy-to-remember conversion, by dividing the px value by 10. This way 6px = 0.6em, 8px = 0.8em, 12px = 1.2em, 14px = 1.4em, 16px = 1.6em. For example:

body  font-size: 62.5%; /* font-size 1em = 10px on default browser settings */ > span  font-size: 1.6em; /* 1.6em = 16px */ > 

The em is a very useful unit in CSS, since it automatically adapts its length relative to the font that the reader chooses to use.

One important fact to keep in mind: em values compound. Take the following HTML and apply it with the previous CSS above:

div> span>Outer span>innerspan> outerspan> div> 

Assuming that the browser’s default font-size is 16px, the words «outer» would be rendered at 16px, but the word «inner» would be rendered at 25.6px. This is because the inner span’s font-size is 1.6 em which is relative to its parent’s font-size , which is in turn relative to its parent’s font-size . This is often called compounding.

Rems

rem values were invented in order to sidestep the compounding problem. rem values are relative to the root html element, not the parent element. In other words, it lets you specify a font size in a relative fashion without being affected by the size of the parent, thereby eliminating compounding.

The CSS below is nearly identical to the previous example. The only exception is that the unit has been changed to rem .

html  font-size: 62.5%; /* font-size 1em = 10px on default browser settings */ > span  font-size: 1.6rem; > 

Then we apply this CSS to the same HTML, which looks like this:

span>Outer span>innerspan> outerspan> 

In this example, the words «outer inner outer» are all displayed at 16px (assuming that the browser’s font-size has been left at the default value of 16px).

Примеры

Пример 1

/* Set paragraph text to be very large. */ p  font-size: xx-large > /* Set h1 (level 1 heading) text to be 2.5 times the size * of the text around it. */ h1  font-size: 250% > /* Sets text enclosed within span tag to be 16px */ span  font-size: 16px; > 

Пример 2

.small  font-size: xx-small; > .larger  font-size: larger; > .point  font-size: 24pt; > .percent  font-size: 200%; > 

h1 class="small">Small H1h1> h1 class="larger">Larger H1h1> h1 class="point">24 point H1h1> h1 class="percent">200% H1h1> 

Live Sample

Примечание

em and ex units on the font-size property are relative to the parent element’s font size (unlike all other properties, where they’re relative to the font size on the element). This means em units and percentages do the same thing for font-size .

Спецификации

Совместимость браузеров

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This page was last modified on 22 февр. 2023 г. by MDN contributors.

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How to set min-font-size in css?

In HTML, it is common to set a specific font size for the text content on a web page. However, in some cases, it may be necessary to set a minimum font size to ensure that the text is readable on different screen sizes and devices. This can be especially important for accessibility reasons, as users with visual impairments may struggle to read small text. In this article, we’ll discuss the different methods of setting a minimum font size in CSS.

Method 1: Using the «min-font-size» property

To set a minimum font size in CSS, you can use the «min-font-size» property. This property is used to set the minimum font size that a text can be displayed as, regardless of the user’s browser settings or zoom level. Here’s how you can use it:

In the above example, the minimum font size for all paragraphs will be set to 16px. You can also use other units such as em, rem, or pt.

In this example, the minimum font size for all h1 elements will be set to 2 times the font size of the parent element.

If you want to set a minimum font size for the entire document, you can use the «html» selector:

This will set the minimum font size for all elements in the document to 12pt.

Keep in mind that the «min-font-size» property is not supported in all browsers, so it’s a good idea to provide a fallback font size using the «font-size» property:

p  font-size: 16px; min-font-size: 16px; >

This will set the font size to 16px and also ensure that the minimum font size is also 16px.

That’s it! With the «min-font-size» property, you can ensure that your text is always displayed at a readable size, regardless of the user’s settings.

Method 2: Using the «vw» unit

To set the minimum font size in CSS using the «vw» unit, you can follow these steps:

1. Open your CSS file and select the element you want to apply the minimum font size to.
2. Use the «font-size» property to set the font size, and the «min-width» property to set the minimum width of the viewport.
3. Combine these two properties using the «calc» function, which allows you to perform mathematical operations in CSS.

Here’s an example code snippet:

p  font-size: calc(1vw + 16px); min-width: 320px; >

In this example, the font size will be set to 1% of the viewport width plus 16 pixels. The «min-width» property ensures that the font size won’t shrink below 16 pixels even on smaller screens.

You can adjust the values of these properties to suit your needs, but keep in mind that using the «vw» unit can cause font sizes to become very small on smaller screens. It’s a good idea to test your design on different devices to ensure readability.

Overall, using the «vw» unit is a flexible and responsive way to set minimum font sizes in CSS.

Method 3: Using media queries

To set a minimum font size in CSS using media queries, you can follow these steps:

@media (max-width: 768px)  html  font-size: 14px; > >

In this example, the font size will be reduced to 14px when the screen width is 768px or smaller.

@media (max-width: 768px)  html  font-size: min(14px, 4vw); > >

In this example, the font size will be 14px or 4vw (whichever is larger) when the screen width is 768px or smaller. The 4vw value ensures that the font size scales with the viewport width.

1. You can also set a minimum font size for specific elements, such as headings, using the min-width property:

@media (max-width: 768px)  h1  font-size: min(2.5rem, 8vw); > >

In this example, the font size for h1 elements will be 2.5rem or 8vw (whichever is larger) when the screen width is 768px or smaller.

Overall, using media queries to set a minimum font size in CSS allows you to ensure that your website remains legible and accessible on smaller screens.

Method 4: Using JavaScript

To set a minimum font size in CSS using JavaScript, you can use the getComputedStyle() method to get the current font size of an element, then compare it to the minimum font size you want to set. If the font size is smaller than the minimum, you can set the font size to the minimum value.

// get the element you want to set the minimum font size const element = document.getElementById('my-element'); // set the minimum font size you want to use const minFontSize = 12; // get the current font size of the element const currentFontSize = parseFloat(getComputedStyle(element).fontSize); // compare the current font size to the minimum font size if (currentFontSize  minFontSize)  // set the font size to the minimum value element.style.fontSize = `$minFontSize>px`; >

In this example, we first get the element we want to set the minimum font size for using document.getElementById() . Then, we set the minimum font size we want to use to a variable called minFontSize .

Next, we use the getComputedStyle() method to get the current font size of the element. We then parse the font size value to a float using parseFloat() .

We then compare the current font size to the minimum font size using an if statement. If the current font size is smaller than the minimum font size, we set the font size of the element to the minimum value using the style property.

Note that this code only sets the minimum font size for one element. If you want to set the minimum font size for multiple elements, you can use a loop or a querySelectorAll() method to get all the elements you want to set the minimum font size for.

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