Summary of CSS vertical centering methods_html/css_WEB-ITnose

To create an HTML unordered list, you need to use a tag to define a list container. Each list item is wrapped with a tag, and the browser will automatically add bullets; 1. Create a list with a tag; 2. Each list item is defined with a tag; 3. The browser automatically generates default dot symbols; 4. Sublists can be implemented through nesting; 5. Use the list-style-type attribute of CSS to modify the symbol style, such as disc, circle, square, or none; use these tags correctly to generate a standard unordered list.

Using tags is the easiest and recommended method. The syntax is suitable for modern browsers to embed PDF directly; 2. Using tags can provide better control and backup content support, syntax is, and provides download links in tags as backup solutions when they are not supported; 3. It can be embedded through Google DocsViewer, but it is not recommended to use widely due to privacy and performance issues; 4. In order to improve the user experience, appropriate heights should be set, responsive sizes (such as height: 80vh) and PDF download links should be provided so that users can download and view them themselves.

To add an icon to the website title bar, you need to link a favicon file in part of the HTML. The specific steps are as follows: 1. Prepare a 16x16 or 32x32 pixel icon file. It is recommended to use favicon.ico to name it and place it in the website root directory, or use modern formats such as PNG and SVG; 2. Add link tags to HTML, such as PNG or SVG formats, adjust the type attribute accordingly; 3. Optionally add high-resolution icons for mobile devices, such as AppleTouchIcon, and specify different sizes through the sizes attribute; 4. Follow best practices, place the icon in the root directory to ensure automatic detection, clear the browser cache after update, and check the correctness of the file path.

Choosing the right HTMLinput type can improve data accuracy, enhance user experience, and improve usability. 1. Select the corresponding input types according to the data type, such as text, email, tel, number and date, which can automatically checksum and adapt to the keyboard; 2. Use HTML5 to add new types such as url, color, range and search, which can provide a more intuitive interaction method; 3. Use placeholder and required attributes to improve the efficiency and accuracy of form filling, but it should be noted that placeholder cannot replace label.

Usetheelementwithinatagtocreateasemanticsearchfield.2.Includeaforaccessibility,settheform'sactionandmethod="get"attributestosenddatatoasearchendpointwithashareableURL.3.Addname="q"todefinethequeryparameter,useplaceholdertoguideuse

First, check whether the src attribute path is correct, and ensure that the relative or absolute path matches the HTML file location; 2. Verify whether the file name and extension are spelled correctly and case-sensitive; 3. Confirm that the image file actually exists in the specified directory; 4. Use appropriate alt attributes and ensure that the image format is .jpg, .png, .gif or .webp widely supported by the browser; 5. Troubleshoot browser cache issues, try to force refresh or directly access the image URL; 6. Check server permission settings to ensure that the file can be read and not blocked; 7. Verify that the img tag syntax is correct, including the correct quotes and attribute order, and finally troubleshoot 404 errors or syntax problems through the browser developer tool to ensure that the image is displayed normally.

Using HTML tags can improve the accessibility and clarity of content; 1. Mark abbreviations or acronyms with abbreviations; 2. Add title attributes to unusual abbreviations to provide a complete explanation; 3. Use when the document first appears, avoiding duplicate annotations; 4. You can customize the style through CSS, and the default browser usually displays dotted underscores; 5. It helps screen reader users understand terms and enhance user experience.

Using FontAwesome can quickly add icons by introducing CDN and adding icon classes to buttons, such as Like; 2. Using labels to embed custom icons in buttons, the correct path and size must be specified; 3. Embed SVG code directly to achieve high-resolution icons and keep them consistent with the text color; 4. Spacing should be added through CSS and aria-label should be added to the icon buttons to improve accessibility; in summary, FontAwesome is most suitable for standard icons, pictures are suitable for custom designs, while SVG provides the best scaling and control, and methods should be selected according to project needs. FontAwesome is usually recommended.