Article Tags
Article Tags
How to set the viewport meta tag for mobile in HTML5? (Responsive design)
The viewportmeta tag must be added, otherwise the mobile terminal will render with a width of 980px by default. The text will be small and the layout will be messy. It is not "non-responsive", but it does not enter the response process at all. The standard way of writing the viewportmeta tag is the most commonly used, most compatible, and adaptable to most modern mobile browsers: This line of code tells the browser: viewport width = device screen width, and the initial scaling ratio is 1 (no enlargement or reduction). width=device-width is the key - it allows CSS units such as 100vw, max-width:100% to truly align with the physical screen, rather than being hard-set to 980pxin by the browser
Mar 04, 2026 am 01:57 AM
How to embedding a Google Map in HTML5? (Iframe usage)
The main reason for GoogleMapsiframe embedding failure is that the URL is not a /embed/ dedicated path, lacks allow permissions, protocols or CSP restrictions; it is necessary to obtain the legal src through the official "embed map", use CSS to responsively control the width and height, and ensure the HTTPS environment and the correct frame-src policy.
Mar 04, 2026 am 12:38 AM
How to create a responsive navigation menu in HTML5? (Mobile friendly)
Use flexbox to implement responsive navigation: set display:flex for the parent container, use media queries to cut columns for small screens, and add flex-wrap:wrap to prevent overflow; use checkbox label and :checked~nav pure CSS to control the hamburger menu, and use position:absolute to hide the checkbox; the viewportmeta tag is required.
Mar 04, 2026 am 12:37 AM
How to refresh a page automatically in HTML5? (Meta refresh)
What will happen if you refresh the page? It can indeed be refreshed automatically, but it is a "hard refresh" - the entire page is reloaded, all status is lost, a new history record is added, and it may trigger repeated form submissions. Modern browsers have long deprecated it, especially in single-page applications (SPA), where location.reload() or routing jumps are more controllable. Common error phenomena: 405MethodNotAllowed (automatic refresh after POST leading to repeated submission), page flashing white, mobile scroll position lost. It is only suitable for minimalist static pages (such as purely display countdown pages and monitoring boards). The refresh interval cannot be less than 1 second (mandatory restrictions of some browsers). The content value is written as "0;u
Mar 04, 2026 am 12:16 AM
How to use the main tag correctly in HTML5? (Accessibility)
There must be only one tag, and it must be the only content body of the page with clear semantics. It cannot be nested within equal partition elements, otherwise it will cause assistive technologies to ignore or report errors.
Mar 03, 2026 am 02:42 AM
How to add keywords for search engines in HTML5? (Meta keywords)
Adding metaname="keywords" to HTML5 is useless, and mainstream search engines completely ignore it. Why metakeywords was deprecated? Early search engines (such as AltaVista in the early 2000s) would read this tag, and the results were quickly abused: stacking irrelevant words, repeated words, hidden words. Google clearly announced in 2009 that it would not use it; Bing also stopped using it as early as 2013; now all mainstream crawlers skip name="keywords" and do not even parse it. Whether you write or not, how much you write, whether you write right or wrong, will have no impact on indexing, ranking, and inclusion. Alternatives Keyword Intent that Really Work
Mar 03, 2026 am 02:41 AM
How to create a sidebar navigation in HTML5? (Aside tag)
Sidebar navigation should be used instead of sidebar navigation because it has clear navigation semantics, is recognized by assistive technologies, and supports focus management; it is only suitable for ancillary content such as annotations. Misuse may lead to accessibility and SEO issues.
Mar 03, 2026 am 02:31 AM
How to change the color of the placeholder text in HTML5? (Pseudo-elements)
Four sets of prefix writing methods should be used to cover all browsers: ::placeholder, ::-webkit-input-placeholder, ::-moz-placeholder, :-ms-input-placeholder. Among them::placeholder is the standard writing method but needs to be supported by new versions such as Chrome≥57.
Mar 03, 2026 am 02:23 AM
How to restrict input to numbers only in HTML5? (Input type number)
type="number" cannot really prevent non-numeric input, because the browser allows pasting letters, inputting e/ /-/. and other characters, and input.value may be empty when encountering illegal values; it needs to be combined with the inputmode="numeric" pattern or JS to monitor the input event regular filtering, and always verify the server side.
Mar 03, 2026 am 02:08 AM
How to create a sitemap structure using HTML5? (Nav and lists)
There are no tags in HTML5; the so-called HTML sitemap is actually a user navigation page handwritten with semantic tags, which is completely different from the sitemap.xml file for search engines to crawl.
Mar 03, 2026 am 02:06 AM
How to send an email directly from an HTML5 form? (Mailto action)
The mailto link cannot submit form data at all. Directly using the form's action="mailto:..." will not send out the content of the input box - the browser only opens the default email client and fills in the recipient and default subject/body, but all input values are lost. This is not a bug, it is the design of the mailto protocol: it does not support POST, does not parse form fields, and only recognizes URL query parameters (and only the four keys to, cc, subject, and body). Common errors: – Outlook or Mail.app opens after clicking submit, but the text is empty – Chinese garbled characters (encodeURIC is not done)
Mar 03, 2026 am 02:05 AM
How to use the meter tag for measurements in HTML5? (Gauge display)
It is suitable for displaying static scalar measurement values within a known range (such as disk usage, power, ratings), and is used to represent dynamic ongoing processes; the two have different semantics and cannot be mixed.
Mar 03, 2026 am 01:52 AM
How to create a sticky footer using HTML5 structure? (Layout guide)
Using flexbox to implement stickyfooter is more reliable because it allows the footer to stick to the bottom without covering the content and adapt to long and short pages, while position:fixed will cover the main text and break away from the document flow.
Mar 03, 2026 am 01:45 AM
How to open a hyperlink in a new browser tab in HTML5? (Target blank)
Use target="_blank" to open a new tab, but you must add rel="noopenernoreferrer". Using target="_blank" directly without adding the rel attribute is a common vulnerability. The new page can access the window object of the original page through window.opener, which may be used to jump, steal sessionStorage, or execute malicious scripts. The correct way to write is this safe combination: link text noopener cuts off window.opener reference (Chrome49, Firefox52, Safari1
Mar 03, 2026 am 12:58 AM
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