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A longdesc (or "long description") file is used to describe images that are too complex to summarize in alt text. Rather than including the description in the CNXML markup, the full, detailed description is contained in a separate file that is linked from the media element. This allows you to describe the image in as much detail as necessary without needing to keep the description short. A longdesc file:
  • Can be any file type, though a basic text-only HTML file is most appropriate.
  • Can be loaded into a Connexions module like any other image or resource file.
  • Is not a replacement for alt text, but instead is a chance for the author to elaborate on alt text.
  • Is only necessary when the image is so complicated that an alt text description is not sufficient to describe it.
The following example shows how to link to a longdesc file titled earnings_report_desc.html : <media id="longdesc_example" alt="An earnings graph showing steady growth of 6% over the past two quarters."longdesc="earnings_report_desc.html"><image mime-type="image/png" src="earnings_report.png" /></media> In this example, earnings_report_desc.html would most likely be a simple text file describing the details of the chart, including the data points, overall trends, and any other relevant information. While the alt text describes "steady growth of 6% over the past two quarters," the longdesc file can talk about specific features of the chart, such as a dip that coincided with a recent merger or a spike that represented a major product release. A screen reader user would have the option of following this link in order to get a detailed understanding of the data that would otherwise be conveyed and understood by sighted users through visual information.
Remember, longdesc files are not common, and are usually only used when the media element contains important visual information that is too complex and/or detailed for alt text.

Captioned video and audio transcripts

Captioning is another important consideration when dealing with video content. Users who are hearing impaired may not be able to understand all of the information being conveyed in a video, limiting their access to the material being described. This can be addressed by submitting videos that are captioned, allowing those users to read along with the spoken materials. If you are not able to caption your videos, another option is to include audio transcripts of the materials as a module resource that can be easily accessed using a link. While there are no specific tools or standards for providing this type of content, the important thing to remember is to make it as easy as possible for as many people as possible to access the information you are trying to communicate.

You can read more about how Connexions addresses accessibility concerns in m17212 - Accessibility Features of Connexions .

Embedding media elements in your module


Once you've attached your multimedia files to your module, the next step is to embed the media files in your content. This can be done by using the <media> element.

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
is it a question of log
I rally confuse this number And equations too I need exactly help
But this is not salma it's Faiza live in lousvile Ky I garbage this so I am going collage with JCTC that the of the collage thank you my friends
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Ideas and tools for improving connexions modules and collections. OpenStax CNX. Mar 22, 2010 Download for free at http://cnx.org/content/col11184/1.2
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