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每次要算 px 跟 em 之間的轉換都很麻煩，compass 又不能直接做變數運算(還是可以我不知道?)。總之我比較習慣用的一個 function 如下，邏輯不複雜，使用方法也很簡單易懂，在這提供給大家做個參考 :)
```
@function em($target, $context: $base-font-size) {
@if $target == 0 { @return 0 }
@return $target / $context + 0em;
}
```
詳細使用方法：https://gist.github.com/ijy/1441967
#1. 一次搞懂CSS 字體單位：px、em、rem 和% - OXXO.STUDIO
rem 是相對單位，為每個元素透過「倍數」乘以根元素的px 值，如果我們每一層div 都使用1.2rem，最內層就會是 16px x 1.2 = 19.2px 。( 根元素指的是html 的font-size，預設 ...
#2. CSS: em, px, pt, cm, in… - W3C
只要是因為(1)不設定本文字體大小(HTML內)，而是使用裝置本身的預設大小，如此一來讀者可以舒適地閱讀；(2)用 em 表達其它元素的字體大小: H1 {font-size: 2.5em} 可 ...
#3. CSS rem、em用法為何？網頁設計字體大小怎麼用 - 玩構網路
是相對單位，用法同em，子元素的字體大小為父元素字體大小的百分比值，如當前元素設定150%的字體即為該元素之父元素的150%字體大小。 <span style="font-size: ...
#4. 認識網頁文字單位－px、%、em、rem - 網頁設計
px為最常見的，屬於絕對單位；%、em、rem則為相對單位。 %單位的算法：. 預設網頁上的文字大小為16px，. 假如設定font-size: 75%，意思就是將預設文字大小改成：16 X ...
以下方的範例可以發現，如果外圍是以 15px ，內層的文字第一層 1em 等同於 15px ，隨後的依比例放大。 font-size: 15px. font-size: 1em. font-size: 1.2 ...
#6. 筆記| 簡單理解CSS font-size的相對單位em、rem
筆記| 簡單理解CSS font-size的相對單位em、rem、% · em. 該元素以倍數乘以父元素(上一層)的px值。 · rem. 該元素以倍數乘以根元素(html)的px值。 · %. 該 ...
#7. Em – Fonts Knowledge - Google Fonts
An em is a unit of measurement, relative to the size of the font; therefore, in a typeface set at a font-size of 16px, one em is 16px. The em square is the ...
#8. Day16 CSS基本樣式-單位與數值 - iT 邦幫忙
單位可以用在width（寬）、height（高）屬性上，也可以用在font-size（字體大小）上，我們在切版的時候，用 ... 那就來介紹一下CSS的單位，px、em、rem、vw跟vh吧。
#9. CSS 小技巧分享：em 單位的強大用途 - Medium
在CSS 中，em 單位是相對長度單位，它是相對於該元素本身字體大小（font-size 屬性）的值。 · 若在一個沒有設定 font-size 的「元素」上，有其他屬性是以em ...
#10. font-size - CSS：层叠样式表 - MDN Web Docs
font -size CSS 属性设置字体大小。更改字体大小还会更新字体大小相关的 单位，例如em、ex 等。
#11. 網頁文字單位－pt、px、%、em、rem｜方格子vocus
單位的算法： 預設網頁上的文字大小為16px=12pt， 假如設定font-size: 75%，意思就是將預設文字大小改成：16 X 0.75=12px 假如設定font- CSS應用, ...
#12. CSS font-size 文字大小 - Wibibi
CSS font -size 文字大小 ; em, <span style="font-size:1em;">1em</span><br> <span style="font-size:2em;">2em</span>, 1em 2em ; cm, <span style="font-size:1cm;">1cm</ ...
#13. CSS Font Size - W3Schools
Note: If you do not specify a font size, the default size for normal text, like paragraphs, is 16px (16px=1em). Set Font Size With Pixels. Setting the text size ...
#14. 4.4：CS2040401 任何CSS樣式規則均使用具名字型尺寸
if CSS樣式內存在font-size且使用具名或相對(如使用百分比或em)的字型尺寸，通過檢測，否則檢測失敗。
#15. Font Sizes in Responsive Design: px vs. pt vs. em vs. percent?
If you don't have one set in the CSS, then 1 em will usually be equal to 16px, which is usually the default font size in browsers. One bad thing about ems is ...
#16. Font Size - Tailwind CSS
You can configure your own default line heights when using custom font sizes by defining each size using a tuple of the form [fontSize, lineHeight] in your ...
#17. CSS沒有極限- CSS的新"文字"及"尺寸"單位| 卡斯伯Blog - 前端
font -size:1.1em. font-size:1.2em. font-size:1.3em. font-size:1.4em. 我們可以調整外圍的 font-size ，就可以影響到內部的文字大小，但是要注意， ...
#18. Em (typography) - Wikipedia
An em (from English em quadrat) is a unit in the field of typography, equal to the currently specified point size. For example, one em in a 16-point ...
#19. What is rem in CSS? rem Unit Font Size, Padding, Height, and ...
For the height of the p tag, rem refers to the font-size of the root element. So height: 4rem on the p tag will be interpreted as 4 times 18px ...
#20. Using em vs. rem in CSS - LogRocket Blog
And when the root font-size is not explicitly set, rem values are relative to the browser's default font-size of 16px . This means that when the ...
#21. 新手必备知识| font-size 的常用长度单位用哪个才好？ - 知乎专栏
但是近年em 的定义有点改变，因为很多语言中并没有M（如中文），所以现在表示文字的高度。CSS 中em 的大小计算是根据当前的元素的font-size 来计算最终的字体大小，其父级 ...
#22. rem vs em: Understanding the CSS Unit Basics - Atatus
The default CSS font size value for most browsers is 16px , so an element with a value of 1rem will also have a CSS font size of 16px . The rem ...
#23. Font.Size 屬性(System.Drawing) - Microsoft Learn
取得這個Font 的Em 大小，此大小是以Unit 屬性指定的單位來測量的。
#24. font-size - CSS Reference
default font-size: medium;. The text will use the browser's default medium size. ... font-size: 20px;. You can use pixel values. ... font-size: 1.2em;. You can use ...
#25. Font size in CSS - % or em? - Stack Overflow
The real difference comes apparent when you use it not for font-sizes. Setting a padding of 1em is not the same as 100% . em is always relative to the font-size ...
#26. rem vs em - Everything you need to know - Refine Dev
Since we know that an em is equal to the point size of the current font, we can deduce that the "root em" refers to the font size of the root ...
#27. CSS units for font-size: px, em and rem - Coding N Concepts
Understand the difference between pixel (px), em and rem and when to use them. Also understand the default font-size and best practices for ...
#28. CSS Relative Font Size - Kolosek
One em (1em) is equal to the current font size. So for example, if the parent element has the font size of 16px than 1em is equal to 16px, 2em is equal to 32px ...
#29. Back to Basic: Should we use Rem, Em or Pixel?
Using Rem and Em units is better than using px. When we use px, it means that we hardcode the font-size to all of the users.
#30. Use Rems for Font Size to Respect User Preferences
In CSS, there are many different units that can be used to size elements on a page— px , vw , ch , em , rem , and far too many others to ...
#31. Setting Font Size with Em in CSS - Tutorialspoint
To set the font-size property in CSS, you can use em. This is beneficial when you need pixel accuracy for the text. By default 1em = 16px, ...
#32. CSS Font-Size Property - Scaler Topics
Font -size is a CSS property that defines the size of the text. We can specify sizes with the help of various units like px and em, percentages, or predefined ...
#33. What Are Rem Units? (& How to Use Them in CSS)
By default, most browsers use a font size value of 16px. So, if the root element is 16px, an element with the value 1rem will also equal 16px.
#34. Font Size Units in Responsive Web Design - LinkedIn
The em is a scalable unit that is used in web document media. An em is equal to the current font size, for example, if the font size of the ...
#35. Which is Better to Use in CSS: px, em, or rem - W3docs
So, in this case, it is not good for user experience. Pixels can be good for spacing and layout, but not for font size. Using em. An em value is equal to the ...
#36. Why you shouldn't set font-sizes using em - YouTube
The first 500 people to sign up using my link will get two free months of Skillshare premium: https://skl.sh/kevinpowell2A lot of people ...
#37. Is it better to use ems/rems than px for font-size? | CSS-Tricks
Feels like we could use more information in this article. For example, em work as a percentage multiplier, so a div with heading 2em and a sub ...
#38. Why you should never use px to set font-size in CSS
rem stands for “root em,” and the root of a webpage is the <html> tag. So, 1rem = whatever the document font size is. (Which, again, by default, ...
#39. How to Change HTML Font Size in CSS - MakeUseOf
Next, enter the font-size property followed by a colon, specify the specific size you want your HTML text presented in, and close it off with a ...
#40. CSS Font Size Experiment - NDP Software
font -size units. words, px, %, em, rem. xx-small, 6px, 5% 10% 20% 50% .3em .5em .3rem .5rem. x-small, 7px 8px 9px, 60% 70% .6em .7em .75em ...
#41. REM and "font-size" for Inspect - Share an idea - Figma Forum
Our developers spend a lot of time in Figma Inspect, having to convert everything from pixels to REM. Implementing a way to specify the ...
#42. How to Use 'ems' to Change Webpage Font Sizes (HTML)
"is equal to the computed value of the 'font-size' property of the element on which it is used. The exception is when 'em' occurs in the value ...
#43. CSS 教學– 基本文字設定: font-size 與line-height - 飛肯設計
首先在<body> 設定文字大小為20px，<h1>是用百分比來做設定，而<h2>則是用「em」這個單位。 假如沒有特別定義文字大小的話，所有網頁的文字大小都會依照W3C 所制定的原始 ...
#44. CSS Font-Size: em、px 、pt 、Percent之间的关系及换算转载
2. em会继承父级元素的字体大小。 重写步骤： 1. body选择器中声明Font-size:62.5%；
#45. Font size conversion: pixel-point-em-rem-percent
An online tool to freely convert between pixels, points, rems (ems), and percent values. Primarily for font-sizes and media queries.
#46. CSS Font-Size: em vs. px vs. pt vs. percent - Kyle Schaeffer
“Ems” (em): The “em” is a scalable unit that is used in web document media. An em is equal to the current font-size, for instance, if the font- ...
#47. mdn em font size - 稀土掘金
例如，如果父元素的字体大小是16px，那么在该元素内使用 font-size: 2em 将会使文本的字体大小变为32px。 要在HTML 中使用 em 单位设置文本的字体大小，你可以在元素的 ...
#48. Typography · Bootstrap v5.0
There are no dedicated mixins for typography, but Bootstrap does use Responsive Font Sizing (RFS). Bootstrap. Designed and built with all the love in the world ...
#49. Font Size (Cascading Style Sheets: The Definitive Guide)
Since the typical default font size has historically been 3, it makes some sense that the third value on the CSS absolute-size keyword list would be used to ...
#50. CSS font-size Property - GeeksforGeeks
The font-size property in CSS is used to set the font size of text in HTML document. ... Property Values: ... Syntax: font-size: medium|xx-small|x- ...
#51. Sizing in CSS: px vs em vs rem | Chiamaka Ikeanyi
Sequel to this, setting the font size of the html element in percentage is recommended. Assuming the browser font size is set to 16px (i.e. the ...
#52. Learn How To Use CSS Font Size - Udemy Blog
To be precise, the default font size is 16px in web development. Things got tricky as different browsers came to market, more CSS fonts were released, and ...
#53. CSS: font-size property - TechOnTheNet
When the font-size is specified as a fixed value in em, the size is determined relative to the size of the parent element's font. For example, 0.75em would be ...
#54. How to change the font size in HTML - Educative.io
In HTML the method of changing a font size is pretty simple and easy. All you have to do is include the tag in the code snippet below. ... The size number must be ...
#55. PX or REM in CSS? Just Use REM - Austin Gil
The document's default font size is 16 pixels, so 1.5rems x 16px is the equivalent of 24 pixels. The fact that rems are relative and they're ...
#56. HTML Font Size Is Out (But CSS Is In)
HTML Font Size Is Out (But CSS Is In): Here's How To Specify Font Size Today ... The Font Element and it's Attributes have been Deprecated This attribute has been ...
#57. CSS Font-size - Javatpoint
The font-size property in CSS is used to specify the height and size of the font. It affects the size of the text of an element. Its default value is medium ...
#58. Why designers should move from px to rem (and how to do ...
rem is a relative unit related to the root font sizes(the r in rem rem actually stands for root). So most of the time 1rem = 16px , however, if ...
#59. Set font-size to 0.75em; (25% smaller) in HTML and CSS
Set font-size to 0.75em; (25% smaller) in HTML and CSS.
#60. How to change font size in html - Linux Hint
In HTML, we can change the size of the font by using the CSS font-size property and set its values in pixels, percentage, viewport width, and ephemeral unit. In ...
#61. Why I Change the Font Size to 62.5% in Every Project
We don't scale down font-size in html to change the root font size, we do it because that number helps us to convert rem to px and another way around, more ...
#62. CSS font-size-adjust | Can I use... Support tables for ... - CanIUse
Method of adjusting the font size in a matter that relates to the height of lowercase vs. uppercase letters. This makes it easier to set the size of ...
#63. Add the essential “rem” and “em” units for font-size, padding ...
Hi Hardeep, I see that “Otter” and also the “Neve theme” don't have the essential “rem” unit option for “font-size, padding and margins” and the “em” unit ...
#64. px、em、rem区别介绍 - 菜鸟教程
为了简化font-size的换算，需要在css中的body选择器中声明Font-size=62.5%，这就使em值变为16px*62.5%=10px, 这样12px=1.2em, 10px=1em, 也就是说只需要将你的原来的px数值 ...
#65. CSS Font Sizing | bitsofcode
em, Relative, Relative to the parent element's font size ... In a blank HTML document, without you declaring any font sizing, ...
#66. What's The Difference Between PX, EM, REM, %, VW, and VH?
REM is relative to the root (HTML) font size, so if you wish to scale the element's size based on the root size, no matter what the parent size is, use REM. If ...
#67. CSS Tutorial => Font size with rem
em : Relative to the font size of the parent. This causes the compounding issue · rem: Relative to the font size of the root or <html> element. This means it's ...
#68. Change the font or font size in Pages on Mac - Apple Support
Change the font or font size · Select the text you want to change. · In the Format sidebar, click the Style button near the top. · Click the Font pop-up menu, then ...
#69. In HTML, how can I change the size of text on my web page?
The size attribute specifies how large a font will be displayed in either relative or absolute terms. Close the <font> tag with </font> to ...
#70. PX to EM converter (instantly and bidirectional) - NekoCalc
Convert pixels to EM. This calculator converts pixels to the CSS unit EM. The conversion is based on the default font-size of 16 pixel, but can be changed.
#71. Sizing Icons | Font Awesome Docs
In addition to that, Font Awesome comes with the following sizing tools. Relative Sizing. Font Awesome includes a range of t-shirt based sizes that not only ...
#72. CSS font-size – rem, em, vw | mediaevent.de
font -size EM ... em wird meist als Maßeinheit für Text eingesetzt. Per se – bevor CSS irgendwelche Schriftgrößen anfasst, liegen die Schriftgrößen ...
#73. 1.2. Specifying Font Measurements and Sizes - CSS ... - O'Reilly
A point, in terms of the CSS specification, is equal to 1/72nd of an inch and a pica is equal to 12 points. Because browser displays vary due to different ...
#74. HTML Font Size Code - Quackit Tutorials
Absolute size refers to an entry in a table of font sizes that is calculated, and kept by the browser (or other user agent). Because of this, the text will ...
#75. Web Font Sizing - The Computer Workshop
Once you know that the default font size is 16px, you can then use ems to allow your clients to resize the page easily but think in pixels for your font ...
#76. CSS Font-Size: A Tutorial on Text Sizing in CSS - Career Karma
The values specified in parentheses are based on a browser whose default font size is 16px . Relative keywords, on the other hand, set a font ...
#77. How to Change Font Size in WordPress (Using 2 Methods)
The default font size in WordPress depends on the theme you are using. It is usually set to 16 pixels, but it can vary. You can check the ...
#78. Getting Started With Setting HTML Font Size | Udacity Tech
To set your own desired HTML text size, the CSS style option is there to help. You will need to manipulate the aptly named style property “font- ...
#79. How To Change Font Size In HTML - ConTEXT Editor
CSS can be used to change the font size of HTML elements. To do this, you must first define a style for the element in the section of your HTML document.
#80. A Walkthrough of CSS Length Units You Can Use for Font Size
You can use points (pt) and picas (pc) to set the font-size in print stylesheets. Both these units have a fixed value of 0.0138 inches and ...
#81. Responsive Typography: rem, em, and px - Element 84
Both rem and em are scalable units of size, but with em , the unit is relative to the font size of its parent element, while rem unit is ...
#82. Typography - Material UI - MUI
You can change the font family with the theme.typography. ... To self-host fonts, download the font files in ttf , woff , and/or woff2 formats and import ...
#83. Font family, size, and color - CKEditor 5 Documentation
The font feature lets you change font family, size, and color (including background color). # Demo. Use the toolbar dropdowns in the demo below to control ...
#84. rem vs em Units in CSS | DigitalOcean
Summary: em units for the font-size property will be relative to the font-size of the parent element. em units on other properties than ...
#85. Font type and font size for text in HTML | The HTML Shark
Today there really is only one way of specifying the font type, and that is STYLE="font-family:name", where the name of the font is written in single quotes ...
#86. How to make printing font size same as screen font size?
You will want to use points (pt) in the print media query since text is done in points on printers. You will have to experiment a bit to get things to look like ...
#87. Must-Know CSS Length Units: px, em, and rem | by Moon
For font size, length means the distance of a letter from its left side to its right side. So, the easy summary is that length in CSS basically ...
#88. font-size 單位使用px, em, rem? | Alice's Note
font -size過去總使用px指定文字大小， 但是為因應各種尺寸裝置兼容問題， 有時電腦版跟手機版分開、更有…
#89. The type system - Material Design 2
The type scale appears as text in components and the overall layout. Type attributes can use custom values for the typeface, font, case, size, and letter ...
#90. html,CSS文字大小單位px、em、pt的關係換算 - 壹讀
為了簡化font-size的換算，需要在css中的body選擇器中聲明Font-size=62.5%，這就使em值變為16px*62.5%=10px, 這樣12px=1.2em, 10px=1em, 也就是說只需要將 ...
#91. 一次搞懂CSS 字體單位：px、em、rem 和% - 每日頭條
以下將展示四種不同單位的示例，為了直觀簡單，四個示例都套用預設的div格式，純粹改變font-size看看有何不同，由於子元素若沒有設定font-size，會 ...
#92. setting font size to 0.9 em (Example) | Treehouse Community
Can someone check my work and let me know what I am missing? I keep receiving an error message that I haven't set the font size to 0.9em.
#93. How to change font size in memoQ
A similar problem occurs in memoQ too: for some reason the needed options happen to be hidden far in the software maze. To change the screen font size in memoQ, ...
#94. How Does Mobile Font Size Impact SEO? - WooRank
Choose a reasonable font size for each type: Title, Headings, Paragraphs. 16 pixels is the default CSS setting. Most themes you installed for your site would ...
#95. What is Font Size? - Computer Hope
How is the font size measured? ... A font is often measured in pt (points). Points dictate the height of the lettering. There are approximately 72 ...
font-size em 在 Why you shouldn't set font-sizes using em - YouTube 的必吃
The first 500 people to sign up using my link will get two free months of Skillshare premium: https://skl.sh/kevinpowell2A lot of people ... ... <看更多>