1. Check whether the HTML elements have spelling errors or forget the closing tag
Even veterans often make mistakes in the nesting relationship of divs. You can use Dreamweaver's verification function to check for errors.
2. Check whether the CSS is correct
Check whether there are spelling errors, whether you forgot the ending }, etc. You can use CleanCSS to check CSS for spelling errors. CleanCSS is a tool to reduce weight for CSS, but it can also check for spelling errors.
3. Determine where the error occurred
If the error affects the overall layout, you can delete the div blocks one by one until a certain div is deleted After the block, the display returns to normal, and you can determine where the error occurred.
4. Use the border attribute to determine the layout characteristics of the error element
Using the float attribute for layout will cause errors if you are not careful. At this time, add the border attribute to the element to determine the element boundary, and the cause of the error will be revealed.
5. The parent element of a float element cannot specify the clear attribute
If you use the clear attribute on the parent element of a float element under MacIE, the surrounding The layout of float elements will be confusing. This is a famous bug of MacIE. If you don't
know about it, you will take detours.
6. Float elements must specify the width attribute
Many browsers have bugs when displaying float elements without specified width. So regardless of the content of the float element, the width attribute must be specified for it.
In addition, when specifying elements, try to use em instead of px as the unit.
7. Float elements cannot specify attributes such as margin and padding
IE has a bug when displaying float elements with margin and padding specified. Therefore, do not specify margin and padding attributes on float elements (you can nest a div inside a float element to set margin and padding). You can also use hacks to specify extraordinary values for IE.
8. The sum of the widths of float elements must be less than 100%
If the sum of the widths of float elements is exactly 100%, some Older browsers will not display properly. Therefore, please ensure that the sum of the widths is less than 99%.
9. Have you reset the default style?
Some attributes such as margin, padding, etc., will be interpreted differently by different browsers. Therefore, it is best to set all margin and padding to
0, list style to none, etc. before development.
10. Did you forget to write the DTD? " -//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd/">

The future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.

The roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.

The future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.

The roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.

WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.


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