国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

current location：Home > Technical Articles > Daily Programming > HTML Knowledge

  • What are opening tags and closing tags in HTML?
    What are opening tags and closing tags in HTML?
    In HTML, the start tag and the end tag are used to define web page elements. The start tag ends with an element name and optional attributes, marks the element's starting position and tells the browser how to handle subsequent content; for example, indicates the beginning of a paragraph. Some elements such as self-closing do not require an end tag. The end tag appears in form and is used to clearly identify the end position of the element. The absence will cause browser parsing errors and affect page layout, style, or script functionality. Correct usage methods include: 1. Ensure that each non-self-closing label has a corresponding end tag; 2. nest the label correctly, close the inner layer first and then close the outer layer; 3. Name the labels with lowercase letters; 4. Appropriate indentation to improve code readability.
    HTML Tutorial . Web Front-end 899 2025-06-28 01:25:22
  • How do I create headings in HTML using the to elements?
    How do I create headings in HTML using the to elements?
    Yes, you can use the to tag to create a web title. 1. Represent the most important main title and the most minor subtitle; 2. Each page should have only one for the main chapters to be used for more segmented sub-chains; 3. Skip skips should be avoided to ensure clear structure and improve accessibility and SEO; 4. Title styles such as font size, color, etc. can be controlled through CSS, and the visual hierarchy can be maintained. Proper use of title tags helps to structure content and optimize the web experience.
    HTML Tutorial . Web Front-end 743 2025-06-28 01:17:11
  • How do I make an element draggable using the draggable attribute?
    How do I make an element draggable using the draggable attribute?
    Thedraggableattributeenableselementstobedragged,butJavaScriptisneededforfullfunctionality.Toimplementdrag-and-drop,firstsetdraggable="true"ontheelement.Next,addadragstarthandlertodefinedraggeddata.Thenusedragoveronthedropzonetoallowdrops.Fi
    HTML Tutorial . Web Front-end 347 2025-06-28 01:11:32
  • What is the purpose of using data-* attributes on HTML tags?
    What is the purpose of using data-* attributes on HTML tags?
    Customdataattributeslikedata-role="button"areusedtostoreextrainformationinHTMLelementsforeasieraccessviaJavaScript.Theyallowdeveloperstoattachsmallbitsofrelateddatadirectlytoelements,suchasitemIDs(data-id),temporarystate(data-state="ac
    HTML Tutorial . Web Front-end 892 2025-06-28 01:07:22
  • How to get or set html attributes with JavaScript?
    How to get or set html attributes with JavaScript?
    To get or set the properties of HTML elements through JavaScript, you usually use the getAttribute() and setAttribute() methods. 1. Use getAttribute() to get the attribute, and pass the attribute name to read the value, such as element.getAttribute('href'); 2. Use setAttribute() to setAttribute() to pass the attribute name and string value in turn, such as element.setAttribute('href','https://new-url.com'), if the attribute exists, it will be overwritten, and if it does not exist, it will be created; 3. Use removeAt to remove the attribute.
    HTML Tutorial . Web Front-end 337 2025-06-28 00:17:41
  • How to select elements using their html attributes in CSS selectors?
    How to select elements using their html attributes in CSS selectors?
    The methods for selecting CSS attribute selector include: 1. The basic attribute selector input[type="text"] is used to fully match the attribute value; 2. The attribute existence judgment is as long as the attribute existence is img[alt] is used to exist; 3. Partial matching is such as [class~="btn"] to match independent words, [href^="/user"] to match the beginning string, [name*="user"] to match the substring, [src$=".jpg"] to match the ending string; 4. Multi-attribute combinations such as buttontype="subm
    HTML Tutorial . Web Front-end 428 2025-06-27 01:59:31
  • When are quotes required for the values of html attributes?
    When are quotes required for the values of html attributes?
    In HTML, attribute values ??require quotes in most cases, but sometimes they can be omitted. Quotes must be used including when the attribute value contains spaces, special characters or multiple words, such as: src="myphoto.jpg", , class="my-classactive", otherwise it may lead to parsing errors. The situation where quotes can be omitted is when the attribute value is a simple word or number without spaces or special characters, such as: required, id=myDiv, cl
    HTML Tutorial . Web Front-end 602 2025-06-27 01:58:51
  • How do event handler html attributes like onclick or onmouseover work?
    How do event handler html attributes like onclick or onmouseover work?
    InlineeventhandlerslikeonclickoronmouseoverattachJavaScriptcodedirectlytoHTMLelements,executingwhenthespecifiedeventoccurs.1)ThebrowserparsesHTMLandcreatesaneventlistenerfortheattribute.2)Whentheevent(likeaclickorhover)happens,thebrowserrunstheJavaSc
    HTML Tutorial . Web Front-end 509 2025-06-27 01:58:22
  • What is the difference between paired and self-closing HTML tags?
    What is the difference between paired and self-closing HTML tags?
    Pairedtagshaveopeningandclosingtagsandwrapcontent,whileself-closingtagsdonotrequireaclosingtaganddonotwrapcontent.Pairedtagslikeanddefineelementswithvisiblecontentorstructurallayout,whereasself-closingtagslikeorareusedforinsertingstandaloneelementssu
    HTML Tutorial . Web Front-end 424 2025-06-27 01:54:11
  • What is the difference between unordered lists () and ordered lists ()?
    What is the difference between unordered lists () and ordered lists ()?
    Answer to the question: None. This article mainly explains the differences and usage scenarios between unordered lists () and ordered lists () in HTML, and does not raise specific questions. 1. Unordered lists are used for items that are not related to order, usually marked with dots; 2. Applicable to shopping lists, product functions, etc. without ordering; 3. Custom styles can be customized through CSS. 4. Ordered lists are used for items with important order, usually marked with numbers or letters; 5. Applicable to operation steps, game rules, etc. where order is required; 6. The numbering format can be customized through the type attribute, such as Roman numerals or letters. When selecting, you should decide which list to use based on whether the order of the item is important.
    HTML Tutorial . Web Front-end 1057 2025-06-27 01:53:51
  • How do I use the element to represent keyboard input?
    How do I use the element to represent keyboard input?
    The key to using tags to represent keyboard input is to understand its applicable scenarios and match them with HTML elements. 1. Applicable scenarios include display shortcut keys, command line instructions and game operation instructions; 2. The basic usage is to place the keyboard input content in the tag, such as Enter; 3. It can be used in a nested manner, such as displaying command line interaction; 4. Adding styles (such as borders, rounded corners, background colors) through CSS can enhance visual effects; 5. Complex key combinations can improve readability by adding class names and spacing. Rational use can improve the semantic clarity and user experience of web page content.
    HTML Tutorial . Web Front-end 193 2025-06-27 01:53:11
  • What are HTML elements, and how are they structured?
    What are HTML elements, and how are they structured?
    HTML elements are the structure and semantic basis of web page content, and are composed of the basic structure containing tags, content and closed tags. For example, in Thisisaparagraph., it is the starting tag, "Thisisaparagraph." is the content and it is the end tag; some elements such as or are self-closed tags do not need to be closed. 1. HTML elements can be nested, but rules must be followed, such as block-level elements should not be embedded within the line elements; 2. Common types include text content elements (such as titles, paragraphs), links, pictures, lists, containers, etc.; 3. Semantic HTML improves accessibility, SEO and maintenance through elements with clear meanings; 4. Correct indentation and structure helps code readability and debugging efficiency. Master the basic elements
    HTML Tutorial . Web Front-end 905 2025-06-27 01:52:22
  • How do I format text in HTML using elements like , , , , , , , , , and ?
    How do I format text in HTML using elements like , , , , , , , , , and ?
    HTML text formatting not only concerns appearance, but also involves semantics and accessibility. 1. Use bold without emphasis, but is used to represent important content; 2. Use visual italics such as the title of the book to express tone; 3. Highlight key information and display secondary content; 4. Display deleted content to represent insert text; 5. Used to subscript such as H?O, implement superscript such as x2. When selecting a tag, it should be based on semantics rather than just style requirements.
    HTML Tutorial . Web Front-end 442 2025-06-27 01:47:32
  • What is the difference between the disabled and readonly html attributes on form inputs?
    What is the difference between the disabled and readonly html attributes on form inputs?
    Both disabled and readonly restrict form interaction, but the submission behavior is different. 1. Disabled input is not submitted with the form, and the data will not be sent to the server; readonly input will submit the value. 2. The disabled field is usually grayed out and cannot be focused through the tab, while the readonly field looks normal. The user can tab focus but cannot edit it. 3.JS can modify the readonly field value, but cannot change the disabled field. 4. If you need to submit uneditable values ??or update dynamically with JS, you should use readonly; if you need to completely block interaction and submission, you should use disabled.
    HTML Tutorial . Web Front-end 890 2025-06-27 01:45:22

Tool Recommendations

jQuery enterprise message form contact code

jQuery enterprise message form contact code is a simple and practical enterprise message form and contact us introduction page code.
form button
2024-02-29

HTML5 MP3 music box playback effects

HTML5 MP3 music box playback special effect is an mp3 music player based on HTML5 css3 to create cute music box emoticons and click the switch button.

HTML5 cool particle animation navigation menu special effects

HTML5 cool particle animation navigation menu special effect is a special effect that changes color when the navigation menu is hovered by the mouse.
Menu navigation
2024-02-29

jQuery visual form drag and drop editing code

jQuery visual form drag and drop editing code is a visual form based on jQuery and bootstrap framework.
form button
2024-02-29

Organic fruit and vegetable supplier web template Bootstrap5

An organic fruit and vegetable supplier web template-Bootstrap5
Bootstrap template
2023-02-03

Bootstrap3 multifunctional data information background management responsive web page template-Novus

Bootstrap3 multifunctional data information background management responsive web page template-Novus
backend template
2023-02-02

Real estate resource service platform web page template Bootstrap5

Real estate resource service platform web page template Bootstrap5
Bootstrap template
2023-02-02

Simple resume information web template Bootstrap4

Simple resume information web template Bootstrap4
Bootstrap template
2023-02-02

Cute summer elements vector material (EPS PNG)

This is a cute summer element vector material, including the sun, sun hat, coconut tree, bikini, airplane, watermelon, ice cream, ice cream, cold drink, swimming ring, flip-flops, pineapple, conch, shell, starfish, crab, Lemons, sunscreen, sunglasses, etc., the materials are provided in EPS and PNG formats, including JPG previews.
PNG material
2024-05-09

Four red 2023 graduation badges vector material (AI EPS PNG)

This is a red 2023 graduation badge vector material, four in total, available in AI, EPS and PNG formats, including JPG preview.
PNG material
2024-02-29

Singing bird and cart filled with flowers design spring banner vector material (AI EPS)

This is a spring banner vector material designed with singing birds and a cart full of flowers. It is available in AI and EPS formats, including JPG preview.
banner picture
2024-02-29

Golden graduation cap vector material (EPS PNG)

This is a golden graduation cap vector material, available in EPS and PNG formats, including JPG preview.
PNG material
2024-02-27

Home Decor Cleaning and Repair Service Company Website Template

Home Decoration Cleaning and Maintenance Service Company Website Template is a website template download suitable for promotional websites that provide home decoration, cleaning, maintenance and other service organizations. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-05-09

Fresh color personal resume guide page template

Fresh color matching personal job application resume guide page template is a personal job search resume work display guide page web template download suitable for fresh color matching style. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-29

Designer Creative Job Resume Web Template

Designer Creative Job Resume Web Template is a downloadable web template for personal job resume display suitable for various designer positions. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28

Modern engineering construction company website template

The modern engineering and construction company website template is a downloadable website template suitable for promotion of the engineering and construction service industry. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28