What is Longdesc used for?

What is Longdesc used for?

The deprecated property longDesc on the HTMLImageElement interface specifies the URL of a text or HTML file which contains a long-form description of the image. This can be used to provide optional added details beyond the short description provided in the title attribute.

How do you use Longdesc attributes?

Attribute Values An id to another element. An absolute URL – points to another web site (like longdesc=”http://www.example.com/description.txt”) A relative URL – points to a file within a web site (like longdesc=”description. txt”)

Is Longdesc deprecated?

The longdesc attribute was never well implemented in the mainstream, and browser support and AT support was inconsistent. It was deprecated in HTML5 but a void existed for a viable replacement and WCAG still required a long description be provided for complex images.

Is Longdesc supported in HTML5?

HTML 4 provided a longdesc attribute for the img element that enabled a machine-discoverable description of an image to be linked to the image. This extension specification defines a longdesc attribute to provide that functionality for HTML5.

What is a long description?

A long description is a way to provide long alternative text for non-text elements, such as images. Generally, alternative text exceeding 250 characters, which cannot be made more concise without making it less descriptive or meaningful, should have a long description.

How do you write alt text on a diagram?

Write Good Alt Text

1. Add alt text all non-decorative images.
2. Keep it short and descriptive, like a tweet.
3. Don’t include “image of” or “photo of”.
4. Leave alt text blank if the image is purely decorative.
5. It’s not necessary to add text in the Title field.

How long is a short description?

At a minimum all Short Descriptions should be at least 150 characters long. Here’s an example of what can happen when your Short Description is not long enough.

What is NAV tag in html5?

The HTML element represents a section of a page whose purpose is to provide navigation links, either within the current document or to other documents. Common examples of navigation sections are menus, tables of contents, and indexes.

How many pages is a summary?

A summary is a brief description of the main points of a work written in “your own words. As a general rule, a summary should be one-fourth the length of the 1-3 page original work.

Can a div have a src?

The HTML src attribute supports frame, iframe, img, input and script elements. It does not support the div element.

Is image Title Important for SEO?

TL;DR: Image SEO key takeaways Alt text has potential SEO benefits, but image titles do not. Make sure all of your images include alt text (with relevant keywords included), and ideally, an image title as well.

What is the use of longdesc in HTML?

longdesc The purpose of the HTML longdesc attribute is to specify a link to a long textual description for images, iframes and frames. When used with img element, it complements alt attribute of img. When used with iframe and frame elements, it complements title attribute.

What is the best longdesc plugin for jQuery?

A excellent solution to the browsers’ lack of longdesc support is demonstrated in a jQuery Accessible Longdesc Plugin by Dirk Ginader. (You can find Ginader’s source code on GitHub .) The script creates a visual indication and link when longdesc is available.

How does the longdesc script work?

The script creates a visual indication and link when longdesc is available. When activated, it replaces the image with the long desciption; this way a new page or window doesn’t need to be opened. The desciption can then be closed, restoring the image.

Is it possible to add an anchor to a longdesc?

Note that since longdesc takes a URI as a value, so an anchor such as #description should be valid value in the same way that href=”#description” is valid. Never however enter the description text itself in the value.