Summarize the three common length units in CSS (px em rem)

The following is a summary of the common html units in web pages, and an introduction to length units in css+p layout. Personally, I think that the disadvantage of using px as the font unit and not being able to use the browser font scaling function under IE is no longer that important. Because the new versions of IE7 and IE8 already support the zoom function of the entire web page, including Firefox, which zooms the entire web page by default instead of scaling CSS fonts. Is there any significance in not simply scaling the font size?

1. Introduction to px in css

1. CSS realizes movement within 1px

The previous article talked about the vertical alignment scheme of inline elements. If you are interested, you can read my previous articles. In the previous article we mentioned the issue of movement within 1px. This article gives solutions to problems within one pixel.

Maybe you have seen the one-pixel border issue on Retina screens. Note that this is the border width and not the mobile element.

2. About the 0.5px setting of CSS border?

What is the principle of achieving this 0.5px border? btw, is transform:scale rarely used in projects?

Border is absolute positioning (position:absolute;), so its positioning is determined based on its nearest non-position:static, while .scale-border is relative positioning (position:relative;)

3. css px automatically converts to rem

Especially when doing mobile adaptation, rem is what we often use Unit, you can search for its benefits by yourself, there are already many online.
But when we convert the px on the design draft into rem, we have to manually calculate it. This is a very time-consuming and laborious process. Is there any way to "liberate" us? (Forgive my laziness~)

2. Introduction to em in css

1. Do you know em and px in CSS difference?

Domestic websites, including the three major portals, as well as Blue Ideal, which "leads" the trend of Chinese website design, ChinaUI, etc., all use px as the font unit. Only Baidu has set an adjustable example. On the other side of the ocean, almost all mainstream sites use em as the font unit, which is adjustable. Yes, px is easier to use than em, and most readers don't know what em is or how much px it is. Foreign people attach so much importance to website accessibility (Accessibility), not only because of its deep-rooted humanistic spirit, but the direct reason may be because there is a law to restrict them - such as Section 508 in the United States, which forces websites to achieve a certain level of accessibility.

2. Mobile terminal-responsive, rem/em, using Js to dynamically realize mobile terminal adaptation

With 3G With the popularity of mobile phones, more and more people are using mobile phones to access the Internet. Mobile devices are surpassing desktop devices as the most common terminal for accessing the Internet. As a result, web designers have to face a difficult problem: how to render the same web page on devices of different sizes? This article will describe the concepts and methods of adaptive web design, which allows web developers to maintain the same web page code to make the website have a better reading experience on multiple devices. This article introduces the implementation method of adaptive web pages in detail, hoping to help you who are confused.

3. Introduction to rem in css

1. Mobile web page adaptation: the use of rem

The requirements for adaptive development of web pages are cross-platform, cross-browser, generally mobile + PC. I wrote several full-screen pages for PC a few days ago, using percentages. I checked the effect on my mobile phone. Far from it. From this point of view, the adaptability of mobile+PC is sometimes a false proposition.

2. Introduction to the use of REM in css3

In Web page production, we generally use "px" to set our text because it is more stable and precise. But there is a problem with this method. When the user browses the Web page we created in the browser, he changes the font size of the browser (although most people will not change the font size of the browser). At this time, he will use our Web page. The page layout was broken, and it was proposed to use "em" to define the font of the Web page.

4. Summary of the differences between length units (px em rem) in css

1. Detailed explanation of the differences between px em rem and css length units Use

Recently I encountered the setting of font size when learning fonts. The font-size unit can be px or em or rem. So what are the differences between these units and how to use them?

px is the basic sampling unit of pixel images. It is only relative to the screen resolution of the monitor. What is a pixel? If you zoom in on a picture, you will see small square grids and squares. A grid is a pixel. The default browser font size is 16px.

2. Summary of the differences between px, em and rem in css

em and rem are both flexible and extensible units, which are converted into pixel values ​​by the browser, depending on Depending on the font size in the design, if a value of 1em or 1rem is used, it can be converted by the browser from 16px to 160px or any other value. Browsers use 1px , so 1px is always displayed as exactly 1px.

3. css font size: em versus px, pt, percentage

One of the most confusing aspects of CSS styling is the font extension of text in an application -size attribute. In CSS, you can use four different unit measurements to display text size in a web browser. Which of these four units is best suited for the Web? This question has caused widespread debate. Finding a definite answer is difficult because the question itself is so difficult to answer.

Questions and answers related to length unit (px em rem):

1. css3 - css sets the height to 1px, and the browser displays 0.99px

2. css - How to put a PC webpage written in px into the mobile phone for automatic adaptation

3. html5 - Detailed explanation of rem and px conversion

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