Hi Again, Today i will be discussing the use of em, rem and px in responsive design mode. I had NO idea what an REM was. In a responsive approach, in which we adjust the font size at set breakpoints, we will often also arbitrarily adjust the width of a container to maintain the right line length. いまさらだけど、font-sizeって何つかっていますか? Back to Top. To find inconsistencies in colors, fonts, illustrations, etc. I have been reading stuff where one way of having responsive font size was to have base font size as px defined in body or html as then use font sizes in rem for different components in body such as p, h1 etc. Our first step is to reduce this size for the entire document by setting body size to 62. The rem unit is relative to the root—or the html—element. However, if the value is 0, the unit can be omitted. But keeping these possible savings in mind while writing your application's stylesheets can significantly lighten your CSS payload, keeping page load times down and user experience positive. If font-size is not. Defaultnya 16 px. REM is dictated by the set root (HTML document) size. React bootstrap builds the componentclassNames in a consistent way that you can rely on. So a rem is really nothing new, it’s merely an em living in a very close relationship with the page root – typically the html element. This means that even if you specify a font size of 30px on your html element, media queries will still use 16px as "em" / "rem" based for the media queries unless you also change your default font size in the browser settings. - Hard to keep relation between all font-sizes (Titles may become too small to make a difference in size in relation to the text) - (Limitted) testing needed to check if the font is scaled correctly - There is a linear relation between the font-sizes and this can be problematic on small screens. The rem unit (i. Rem (short for ‘root em’) is also similar in its functionality, although it deals specifically with font sizes, and derives its name from the value of the font size of the root element – which should default to 16 pixels on most browsers. I had NO idea what an REM was. Whereas rem only depends on the font-size of the root element, and not of the parent. com/viewtopi. Before the advent of responsive design, pixel was widely used as THE font sizing for everything from typography to width. Because responsive units aren’t available in react-native at the moment, I would say your best bet would be to detect the screen size and then use that to infer the device type and set the fontSize conditionally. 4rem // 24px To support IE7 and IE8 we'll need to fall back to pixels. That is, If font-size of the root element is 16px then 1 rem = 16px for all elements. In today’s world of responsive designs, relative units like the em or rem units give us adaptability and flexibility right out of the box that allows for sizes to be based on the font-size(s) defined higher-up in the markup. いまさらだけど、font-sizeって何つかっていますか? Back to Top. For example, Sketch displays pixels instead of rem. In this example I’m defining a base font-size of 16px which is the reference of the font-size of the other element. 2 Fluid REM-unit rescaling. Assuming the browser font size is set to 16px (i. If you have a paragraph in that div with font-size: 1. That means that we can define a single font size on the html element and define all rem units to be a percentage of that. So 1em equals 16px by default. Say you have a sizing structure something like this:. The minimum font-size is set to 1rem (16px). Alex Wilson, of the then Paisley Market, was instrumental in its’ inauguration with. If you use rems for setting font sizes, here's a tiny tool to calculate the rem sizes you need for your css. As you will discover in the lessons on responsive design in the CSS Layout Fundamentals course, percentage units are a key component in the flexible grids needed for responsive design. So Bootstrap’s global default font-size is 16px. EM and REM are used mainly when working with responsive design. Understanding Font sizing in CSS: em - px - pt - percent - rem August 9, 2012 by NARGA Editorial In CSS3, you're found sixteen (Yes, sixteen!) different units by which you can measure the size of text with font-size attribute. 85em;" for text you want smaller than normal (normal being 100%, the default, and what each user is supposed to find comfortable for their eyesight on their. For example, with the base font size set to 62. Font sizes When setting a font size I mostly use the rem unit , which references the pages root font-size and eliminates cascade issues. Em is related to font size of the parent element. Here's the difference between em and rem in a nutshell: Em: The size is relative to the parent element. parent retains the default font-size of 16px, because we do not set it to anything else. As soon as you design a responsive body text for your web page, it's crucial to remember to adjust not only the font size, but also the line spacing. How to make Text responsive in Bootstrap As you can see in the image below, the text on the second line i. When the font size of both a child and its parent are set at 80%, the child ends up being 80% of 80% of the em. ここでremなんですよ。remは先述の通り、html要素のfont-sizeを1とする単位です。 ブラウザデフォルトのhtml要素のフォントサイズは16px。つまり2remは32pxですね。. 「remはフォントサイズだけのものではない」という事実を知ると、実はかなり便利な単位だったりします。 詳細についてはこちらのページにも解説・デモがあります。 remとは. When developing with Responsive web design (RWD), you should use these CSS3 feature reset padding, margin of body and container element. The rem (for “root em”) is the font size of the root element of the document. Is there some base font size, which can be changed through javascript?. 5% to 50%, for example, and everything is scaled proportionately across the site. 16px = 1rem (base) 18px = 1. Rem is related to font size of the root element. That means that we can define a single font size on the html element and define all rem units to be a fraction/multiple of that and not have to worry about units compounding as they do with the em unit. Don't reset the HTML font size if doing responsive design. closing this, as the discussion is getting circular. body {font-size: 1rem;} // And continue working with rem-font-sizes. Max Luster has a great example of this here. e (14px = 1rem so 10rem = 14px X 10 = 140px). As the viewport gets smaller, the font-size will get smaller. Fonts now render at the same size, but rem units are now twice the size. 1) I set the base font-size to 10px inside html. Since the formula will calculate the font-size between our breakpoints of 414px and 1440px, we need to use media queries to force our minimum and maximum font-size values below 414px and greater than 1440px. Whereas rem only depends on the font-size of the root element, and not of the parent. It has an effective feature that offers to set it in opened or closed state corresponding to the specified resolution. Bootstrap's font sizes are calculated off of the body font size by using rem values. So let's imagine a parent div has a font size of 16px. entry-title) and screen sizes. I considered adding a section on how to adjust font sizes whilst maintaining vertical rhythm. Most of the time that means. 5px, and the font-size will be 8px. Here are some responsive design testing tools you can use:. Since 1px = 0. HTML・CSS 2018. 2em;font-weight:500; } HTML. Viewport units is an interesting CSS feature that allows you to automate some aspects of your responsive design. rem - stands for root em. The CSS3 specification included a new unit named rems. What's the difference between CSS's margin and padding?. And that might not be how you really want it to go. Use a body font size around 16px. 1em is equal to the current font size of the parent element. For older versions of Internet Explorer, we can specify the font-size in px units first and define the rem units along with it and we can have a resizable text on. This Web Design Essentials Course will teach you all the basics about HTML5 and CSS3 for beginners. In this blog post I like to discuss the difference between em and rem which @shidhin taught me. EM is dictated by the set parent size. Instead they respond to the browser zoom/type size settings, such as if you press Ctrl and + together on the keyboard while in the browser. Font sizing with rem. Every browser predefines a certain font-size to every element that inherits html and body. Here’s how these basic styles look when you use rem:. The em unit is relative to the font-size of the parent, which causes the compounding issue. The factor which determines the strength of font size resizing is set to 5. As I said earlier working with ems is quite tricky because it can get its value relatively from its parent element so in case of nesting it is impracticable (if the parent has em value too), but this is where the rem came in which is only. Let's Begin. 17 田中 陽介 【CSS】font-sizeの使い方!pxやrem、%などの使い分けも解説. What are fluid-responsive fonts? Also known as: Responsive typography (excellent article), Flexible Type, Fluid Type, Viewport Sized Typography and even Responsive Display Text. The rem unit is relative to the root—or the html—element. Some units will look at the font-size of another element (or that element), while others will look at the size of the view port. h1 wird also 49,92 px groß. This has pretty good modern browser support, it's just IE 8 and down we need to provide px fallbacks for. css, I noticed the use of "REM" to set font sizes and margins. nav-container span {font-size: 1. rem - stands for root em. 「remはフォントサイズだけのものではない」という事実を知ると、実はかなり便利な単位だったりします。 詳細についてはこちらのページにも解説・デモがあります。 remとは. REM, short for root em, is one of the font-relative measurement units commonly used in css. Instead they respond to the browser zoom/type size settings, such as if you press Ctrl and + together on the keyboard while in the browser. Unlike the em, which may be different for each element, the rem is constant throughout the document. x Ready WooCommerce 3. font-size 23px A cracking article on increasing the size of your font on websites starting with the body copy. The vmin and vmax values are whichever is smaller respectively larger of either the vh or vw. The font size should be defined in relative units, such as percentages, em or rem. child {font-size: 12px;} Now with the popularity and acceptance of the Responsive Design (web applications accessible in any devices) developers and designers are thinking more about scale things and make it fit to their user’s device. Em is related to font size of the parent element. There is pixels (px), ephemeral units (em), root ephemeral units (rem) and percent. Font size units Em and Rem are relative to other font sizes. In order for em and rem to work effectively the parent section needs to have a set font size. 5% to 50%, for example, and everything is scaled proportionately across the site. 4 | 05 Oct 2019 AMP Fully Compatible WordPress 5. 2em , then you will have a font in that p tag that is 1. If you use rems for setting font sizes, here's a tiny tool to calculate the rem sizes you need for your css. Let's look at a couple more: vw and vh. Let’s Begin. css size: 55B */. 833rem; // 10px } Not much has changed. Making your font size responde to your screen size, easy & maintainable. Your site font size should be related to its parent container width, so it can adapt to the screen of the client and be easily readable on mobile devices. This gets us around the compounding font size issue we experience with em units. So additional options would just slow down the process. remの出番はfont-sizeにあり. I an open web evangelist and community engineer. body font-size 1. This recipe is a simple example of responsive typography. Before the advent of responsive design, pixel was widely used as THE font sizing for everything from typography to width. Hi Again, Today i will be discussing the use of em, rem and px in responsive design mode. However there is a neat code snippet by Roman Rudenko that simulates vw with rem and some JavaScript. PX to REM Converter. So if the html element has a font-size of 16px, then a paragraph with font-size of 2rem will always be 32px, regardless of the its parent div or any other element. Until recently, most developers used pixels to define font sizes. I experimented with using only rem values for font size, but found that to be restrictive. Font size units Em and Rem are relative to other font sizes. , “HTML tag” “em” font-size unit referred to parent element. As the viewport gets smaller, the font-size will get smaller. 14px * 5em = 70px. rem adalah satuan ukuran font yang populer digunakan akhir-akhir ini, terutama sejak CSS3. 5 rem is equal to 27px. Let's Begin. I talked about using rem and em for responsive typography and for building modular components in two blog posts previously. The practice consists of a mix of flexible grids and layouts, images and an intelligent use of CSS media queries. Since 1px = 0. It's very similar to the em, except that the font size defined using rem is set relative to the font size of the root element, the html, instead of the body, and this is where the r in rem comes from, as rem stands for "root em". Easy-peasy Rem Conversion with Sass Rem is a value that is relative to the root font-size, Opera Mobile doesn't support 'rem', good to know for. 5rem;} p{font-size: 1rem;} While the sizes of H1 and H2 will change from design to design, anchoring the size of p at 1rem is a useful convention. If you change the body font size all styles will be increased/decreased automatically. 2em means two times the size of the current font. CSS3 introduces a few new units, including the rem unit, which stands for "root em". Fix the Font size bug in Google Chrome Quick fix to the font-size bug in Chrome browser for 'rem' and percentage units - short CSS and JavaScript code snippets to get rid of it. Responsive Styles in the Style Manager Another way to to use a different font, text size or color in breakpoints in by using styles. This was the best method I could come up with when I first started creating responsive websites: p { font-size: 16px; } @media (min-width: 800px) { p { font-size: 18px; } } /* Repeat for h1 - h6 and other type groups */ I've learned a lot more about. 10 x 20 = 200. The design of a font within a digital text document and online is known as web typography. - Hard to keep relation between all font-sizes (Titles may become too small to make a difference in size in relation to the text) - (Limitted) testing needed to check if the font is scaled correctly - There is a linear relation between the font-sizes and this can be problematic on small screens. I'm a consulting web developer, writing technical books with O'Reilly, running frontend workshops, and speaking about web development, performance, and other fun stuff all over the world. 5 = 15px */} The CSS background-size property is used to specify the size of the background image. So here's my idea: you still keep px size adjustments at the document level so you can make easy/efficient sweeping size changes. You can use them on anything, not just font-size. Rem units have proved to be very helpful in design as they can be calculated a lot easier. 85em;" for text you want smaller than normal (normal being 100%, the default, and what each user is supposed to find comfortable for their eyesight on their. Fix the Font size bug in Google Chrome Quick fix to the font-size bug in Chrome browser for 'rem' and percentage units - short CSS and JavaScript code snippets to get rid of it. PX to REM Converter. An increase in default font-size will proportionately effect the breakpoints, so in my opinion, the EMs still have it. Unlike the em, which may be different for each element, the rem is constant throughout the document. no increased font sizes) the size of the text on the screen for each device is different. Determining a unit of measurement to size our text can be a topic of heated debate, even in this day and age. Another way of setting the font size is with em values. It is not possible to zoom text set in pixels independently from the rest of the page in some browsers. For example, if you want the byline of an article to always be 14px, then set that as the base font-size on the HTML element and set. Responsive design makes it possible to adapt a website to any screen. ページ内でまだフォントサイズをセットしていなければ、ブラウザのデフォルト、おそらく 16px が使われます。したがって、デフォルトでは 1em = 16px であり、2em = 32px です。もし body 要素で font-size を 20px にセットすれば、1em = 20px で 2em = 40px です。本質的には、値の 2 が現在の em の大きさの乗数であることに注意してください。. When working with responsive layouts and responsive typography especially, using rem instead of em or pixels might help you get to the finish line faster and with less frustrations down the road. 困惑 不足和困惑 我的困惑 奔三困惑 两难困惑 Torry的困惑 一些困惑 3721的困惑 学习困惑 克服困惑 困惑 困惑 困惑 困惑 困惑 困惑 困惑 困惑 问题困惑 困惑-感悟 职业生涯 srilm ppl 困惑度 srilm困惑度ppl1 lda topic 数量 困惑度 1038: 二哥的困惑 Ⅰ lda困惑度取值范围 LDA主题困惑度计算 代码 osg改变视点和. We change font size in children using ems, a unit relative to the font-size of the parent. This makes it easy for developers to define a single font size on the html document and then define all rem units to be a percentage of that. That way the text size will follow the size of the browser window:. This simply means that the size of the font is relative to the root's font size, not the parent, as with the EM unit. I talked about using rem and em for responsive typography and for building modular components in two blog posts previously. You may have used em and rem CSS units for a while but the difference between the two still appears vague. 4rem // 14px h1 font-size: 2. you will need to do a mobile responsive test using real mobile devices. Whereas rem only depends on the font-size of the root element, and not of the parent. Font sizes When setting a font size I mostly use the rem unit , which references the pages root font-size and eliminates cascade issues. Forms to 72 and on 2 different devices (Galaxy S7 & iPhone 6) with default settings (i. My name is Estelle Weyl. But I need to have something to base my design on. - Hard to keep relation between all font-sizes (Titles may become too small to make a difference in size in relation to the text) - (Limitted) testing needed to check if the font is scaled correctly - There is a linear relation between the font-sizes and this can be problematic on small screens. 0em (effectively making it 24px) you're still setting a hard value to the element. So let's imagine a parent div has a font size of 16px. Let’s see an example of some common font sizes expressed in rem units, assuming, of course, that the base size is 16px: 10px = 0.  I want to remove that resizing or customize it so my Revolution slides are usable to my visitors on mobile devices. This was the best method I could come up with when I first started creating responsive websites: p { font-size: 16px; } @media (min-width: 800px) { p { font-size: 18px; } } /* Repeat for h1 - h6 and other type groups */. 2 em of the 16px font, or roughly 23px on the p tag instead of ~19px that you would expect. Browser default font size would typically be 16px. Determining a unit of measurement to size our text can be a topic of heated debate, even in this day and age. The 2em means it will be two times larger than the base font size, which is our responsive font size we set on html, which is perfect. So additional options would just slow down the process. If you set your font-size to 62. Don't reset the HTML font size if doing responsive design. The rem unit defines the length of an element based on the font size of the root node (the html node in this case), rather than the font size of the current element such as em. Since the font size cascades and all font sizes are relative to the parent, you end up having to recalculate a lot of em values. RWD - Responsive web design. Note: I'm not asking about using px, em, pt, %, rem, etc. [see CSS: Border]. font-size units words px % em rem xx-small 6px 5% 10% 20% 50%. 75em se račauna na osnovu root elementa koji je 30px, pa dobijamo 30*. I’ve been trying to increase the font size of the main menu items, the blog text, post title, slideshow caption title, slideshow call to action button label text. 5em = 375px, 60em = 600px. Use em or rem for responsive font size. We can therefore use mediaqueries to scale down this base size on smaller screens, which means a breakpoint based responsive font size for browsers that do not support the vw-unit. We equate this with a font-size value of 100% or 1em or 1rem. ems are font-relative length units. However, I feel like we have allowed the lack of variety prior to the rise of web fonts to dampen our creativity now that thousands of web fonts are at our. --> --> --> img. The x-height is determined by the height of the font's lowercase letter x. Font-sizes are configured and rendered in rem units. The rem unit is similar to the em unit. However, CSS3 introduces a new proportionately-sized text unit rem. Parent container: 18px. I have been reading stuff where one way of having responsive font size was to have base font size as px defined in body or html as then use font sizes in rem for different components in body such as p, h1 etc. Rem is related to font size of the root element. 25 x 16 = 20. rem units can be influenced by font size inheritance from browser font settings. Em and rem are similar and 1em means basic font size, while 2em means twice as big. Changing the html font size will scale the. example below will allow allow us to scale up font sizes for responsive devices simply by writing. , if an element is displayed with a font of 10 px, then '2em' is 20 px. Use rem for margin or padding otherwise. ページ内でまだフォントサイズをセットしていなければ、ブラウザのデフォルト、おそらく 16px が使われます。したがって、デフォルトでは 1em = 16px であり、2em = 32px です。もし body 要素で font-size を 20px にセットすれば、1em = 20px で 2em = 40px です。本質的には、値の 2 が現在の em の大きさの乗数であることに注意してください。. Using em's and changing the font size on the body we can do much of the work for a responsive vertical rhythm I wrote a fairly lengthy post previously on vertical rhythm. Rem is set to different sizes according to the font size of document elements and nodes EM is based on the font size of the current object @media screen and (device-width: 640px) { html { font-size: 100px; color: blue } } div { // Here 1rem is 100px width: 1rem; }. However, if you will not change font-size later on, there is nothing to worry about. Many CSS properties take "length" values, such as width, margin, padding, font-size, etc. entry-content pのfont-sizeの数値を小さくして、@media screen and (min-width: 470px){}の中に書いた方の数値を大きくすれば、無事スマホで見たときの文字の大きさが小さくなり、パソコン・タブレットで見たときに大きくなった。 数値は各自で設定しよう. Rem stands for "root em" because it calculates the size based on the size of the root of the document or body tag. Mozillaの説明によると、 rem ルート要素の font-size (例えば、html 要素の font-size. body{ font-size:16px; }. That way the text size will follow the size of the browser window:. If you change the body font size all styles will be increased/decreased automatically. Instead they respond to the browser zoom/type size settings, such as if you press Ctrl and + together on the keyboard while in the browser. Responsive typography [14] - font size can be defined in terms of the vw unit; How to Scale SVG [15] - svg size can be defined in terms of the container instead of using px sizes; CSS Locks [16] - linear interpolation css properties between two values. As you set REM based margins and paddings to create space between objects, working in units relative to your paragraph font-size helps to create a vertical rhythm that will guide the. The new unit value for font sizes is rem with a pixel fallback to support all browsers. + Perfect control over every font-size for every screen-width. 5% and not 6. Bootstrap 4 with Responsive Font Sizes (RFS) Posted: February 21, 2019 Bootstrap v4. And the @font-base-size is defined as 14px in variables. If you go with the em, you make that responsiveness task more easier. I've created a site using the Zurb Foundation 3 grid. Register Service Level Agreement Policy Template with Metrics. Though in the rare case where I'm relying on the cascade, I fallback to em. point is: rem takes the browser/user's base font size (usually 16px, but not always) as a starting point. In this case 10rem would equal 200px , i. Many CSS properties take "length" values, such as width, margin, padding, font-size, etc. However there is a neat code snippet by Roman Rudenko that simulates vw with rem and some JavaScript. Parent container: 18px. //The em Ems are a relative measure of length. 85em;" for text you want smaller than normal (normal being 100%, the default, and what each user is supposed to find comfortable for their eyesight on their. When you declare the font-size of an element, if you use ems, it will be relative to the parent's font-size. Don't reset the HTML font size if doing responsive design. The em unit. If you haven't set the font size anywhere on the page, then it is the browser default, which is often 16px. Responsive Typography – Adjusting typographical styles based on screen size. Having the ability to set legible body copy is an absolute must, and we’ve come a long way with web typography since the dawn of web design. Font sizes When setting a font size I mostly use the rem unit , which references the pages root font-size and eliminates cascade issues. This simply means that the size of the font is relative to the root's font size, not the parent, as with the EM unit. As a result, the value will cascade if used on child elements. A button would be a block. They all leverage the viewport width, and / or height, to smoothly scale the font-size rather than switch at specific breakpoints. less I have been reading stuff where one way of having responsive font size was to have base font size as px defined in body or html as then use font sizes in rem for different components in body such as p,. The actual, physical height of any given portion of the font depends on the user-defined DPI setting, current element font-size, and the particular font being used. Rem Font Sizing and Family Sets. The rem unit defines the length of an element based on the font size of the root node (the html node in this case), rather than the font size of the current element such as em. Getting that to happen is a pretty simple proposition, since we’re only concerned with the font size:. Such rules occur 31 times in Bootstrap 3. 6 * 16 = 25,6 pixel font before showing the 16 pixels I intended it to be. Because percentages are often used to resize elements including fonts, it is possible to add percentages on top of percentages. font-size: 87. Understanding em unit. rem은 root의 글자크기를 기준으로 배수를 곱하여 적용되므로 반응형 타이포를 설계할 때 root만 조정하면 되는 편리한 기준이다. A secondary block with a smaller font-size as root font size, and containing this button, would display it too big. 3 hinzu und ein unschuldig wirkendes font-size: 2em im h1-Element ist um den Faktor 3,12 größer als die Basis-Schriftgröße von 16px. Responsive typography is a tough nut to crack. Since rem uses the font size of the root element instead of the font size of its parent element. I’ve been trying to increase the font size of the main menu items, the blog text, post title, slideshow caption title, slideshow call to action button label text. CSS Font Sizing: Pixels vs Em vs Rem vs Percent vs Viewport Units. "94%" and then set… Ems to Pixel Conversion-Why 62. Accordion content should also have an ID, or the # of. REM and EM in CSS bookmark CSS3 access_time 3 years ago 2 months ago person cssstars chat_bubble 0 One of the most confusing aspects of CSS styling is the application of the font-size attribute for text scaling. We're still setting the base font size using a percentage to set it as 12px, but now our other font sizes use rem relative to the base font. A font size of at least 16 pixels is works well for body copy. This is (almost) always 16px for both units. em is a relative unit: it depends upon the value of the element's font-size. 31 May, 2011 Font sizing with rem could be avoided. Challenge website to make responsive: http://forum. So whenever you specify the font-size of a element, it basically overwrites that browser's property. 完善政党协商制度决不是搞花架子 - news. Its size inherits from the font-size (for example) sets defined by default in the body. In a responsive approach, in which we adjust the font size at set breakpoints, we will often also arbitrarily adjust the width of a container to maintain the right line length. Font size units should be REM. The browser will take these two values in the background to figure out it will need to render the font in the child as 24px, as 150% of 16px is 24. Use rem units for sizing that doesn't need em units, and that should scale depending on browser font size settings. 85em;" for text you want smaller than normal (normal being 100%, the default, and what each user is supposed to find comfortable for their eyesight on their. A problem with using vw in this manner is the difference in text block proportions between portrait and landscape devices. Because of the way the rest of this site is done I’m going to set the font size in pixels rather than in EM’s or REM’s. If you used Pixels, mobile styles should have been modified. Because percentages are often used to resize elements including fonts, it is possible to add percentages on top of percentages. However, with fluid typography, adjustment at specific breakpoints becomes unnecessary. อย่าลืมว่า rem นั้น จะไช้ได้ตั้งแต่ IE เวอร์ชัน 9 เป็นต้นไป ดังนั้นก่อนที่จะใช้ rem ให้เราใส่ font-size ในหน่วย px เอาไว้ด้วยเสมอ แต่ถ้า. Say you have a sizing structure something like this:. font-size 23px A cracking article on increasing the size of your font on websites starting with the body copy. ems are font-relative length units. For instance, I have a side bar that takes 25% of the browser and a main content area which will take up 70%. This was originally done with the idea that people could associate an EM value of 1. Just like the below animation shows. Yes, browsers not supporting rem's wont get responsive type, but that's not a bad thing per se because most mobile browsers support it and old desktop browsers will just get te "regular size" with pixels, which they would also get if they supported rem's. 2rem; } In all three of the nested divs in the previous example, the font would evaluate to 16. They all leverage the viewport width, and / or height, to smoothly scale the font-size rather than switch at specific breakpoints. Just like em, px, whatever. e (14px = 1rem so 10rem = 14px X 10 = 140px). CSS divide las unidades de medida en dos grupos: absolutas y relativas. It's a desktop-first approach which automatically calculates the correct font size for every screen width. In both posts, comments about viewport based units inevitably comes into the picture. I’ve had more success with using both ems and rems for different purposes. Sass function and mixin to use rem units with optional pixel fallback. 完善政党协商制度决不是搞花架子 - news. 1em is equal to the current font size of the parent element. body{ font-size:16px; }. , if an element is displayed with a font of 10 px, then '2em' is 20 px. You could start with a global size of 18px for the smallest screens, and once you hit screens that are at least 900px wide, adjust the global font size to 20px. entacl Lab. Every browser predefines a certain font-size to every element that inherits html and body.