Scrapy Introductory Learning Notes (2)--XPath and CSS parsing and parsing Web pages sample

recently learned to use the Scrapy framework to write a reptile, simple crawler is to crawl from the Web page, parse the page, and then data storage and analysis, from the Web page parsing to the data conversion storage. The analytical techniques

How to use CSS to set text styles in HTML __html

one. Length Unit 1. Relative type A PX (PIEXL) pixels, which represent different lengths depending on the resolution of the display device, are relative types. For example, a picture with a width of 100px is larger than the 1024x768 resolution in 800

Css,font-family, good-looking Chinese fonts

Example 1 (Mi mi official website): font-family: "Arial", "Microsoft Yahei", "blackbody", "Arial", Sans-serif; Example 2 (Taobao Technology Research and Development Center): font:12px/1.5 tahoma,helvetica,arial, ' song Body ', Sans-serif; Example 3 (

Pure CSS drawing of various graphics, including basic rectangles, circles, ellipses, triangles, polygons, but also a little more complex love, diamonds, yin and yang gossip, etc.

Today in Css-tricks saw an article, that article let me can not help but the heart of a shock, powerful CSS Ah, incredibly able to draw so many basic graphics. The graph includes basic rectangles, circles, ellipses, triangles, and polygons, as well

Div+css vertical navigation menu and level two menu Popup

1) Portrait navigation menu Home Page layout layout Default style refers to the default style of the UL tag, the original point, loading the picture with a border, and so on, remove the default style

2017.9.24 HTML+JAVASCRIPT+CSS-based development case &&javascript+css+div realizing table discoloration

1.javascript+css+div Implementation drop-down menu1.1 Layer Label Basic syntax:Width:200px;henght:100px;background-color: #33CC99;Float:none;clear:none;z-index:1 ">Syntax Description:The position attribute is mainly to define the positioning method

15 not to be missed front-end development JavaScript and CSS Class Library-version 2017 ~

The front-end JS and CSS class library is changing, in today's introduction, we will carefully select 15 excellent JS/CSS class library, I hope you will find it helpful in the development process ~ Core UIA set of UI class libraries based on

Analysis on CSS3 's @font face rule

This article mainly introduces the real understanding of the CSS3 background of the @font face rules, with a certain reference value, interested in small partners can refer to A lot of people as long as a mention @font face rules, the heart will

What are the format context (FC) types in a CSS layout? Description of type of format context (FC)

What is a format context (FC)? A formatting context, which refers to a rendering area on a page, has a set of rendering rules that determine how its child elements are positioned and how they relate to and interact with other elements, so what are

About the use of CSS3 units VW and VH

This article mainly introduces the use of CSS3 new unit VW, VH tutorial, this article through the example code to introduce the meaning of VW, VH, Vmin, Vmax and the difference between VW, VH and% percent, interested friends to see it

CSS interlaced color-changing tutorial

We know that in the HTML, Ul,li list before the need to use the color difference layout effect, then ul Li how to use CSS to make interlaced color? Today we will give you an example to demonstrate. In order not to affect the program to make calls,

Summary of common color gradient methods

This time to bring you common color gradient method summary, so that the color gradient method of attention to what, the following is the actual case, together to see. One, linear gradient: linear-gradient Grammar: = Linear-gradient ([[ | To [, ]+)

Background tag Summary in the most complete CSS

In CSS development we often use background, this article is mainly for everyone to bring a CSS background all summarized. Small series feel very good, and now share to everyone, but also for everyone to do a reference, hope to help everyone. All

Using CSS to achieve the sharp corners of the page, small triangles, different directions, sharp corners

This time to bring you to use CSS to achieve the page's sharp corners, small triangles, different direction of the sharp angle, using CSS to achieve the page's sharp corners, small triangles, different directions of the point of attention to the

CSS implementation background image translucent content opaque code sharing

This article mainly and everyone introduced the pure CSS to achieve the background image translucent content of the method, small series feel very good, and now share to everyone, but also for everyone to do a reference, hope to help

How do I learn css? What knowledge points to learn

Every programmer who learns a programming language must learn HTML and CSS, which are not programming languages, but markup languages. The former is used to add the structure of the Web page, the latter is the style, used to beautify the HTML

Summary of methods for optimizing and improving performance in CSS

CSS optimization is mainly four aspects: Load performanceThis aspect related to the best practice too much, on-line search is a bunch of information, such as do not use import Ah, compression ah and so on, mainly from the reduction of file

A detailed explanation of the font-weight and working principle of the font bold attribute in CSS

font-weight allowable value Normal | bold | bolder | lighter | l00 | | | | | | Font-weight Initial value Normal Font-weight can inherit is Font-weight applies to all elements In order to understand how the user agent determines the weight of the

The usage of analytic text-transform and the example tutorial

Grammar:Text-transform:none | Capitalize | Uppercase | lowercase Parameters:None: No conversion occurs Capitalize: Converts the first letter of each word to uppercase, and the remaining no conversions occur Uppercase: Convert to uppercase Lowercase:

CSS3 animation attributes: animation (animation), css3animation

CSS3 animation attributes: animation (animation), css3animationI. animation Parameters Because the animation is used above, we will introduce the parameter of this animation in detail here.Introduction In short, CSS animation (Animations) is to

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