cobs.si Website Information

Daily Unique Visits: 1,304

Daily Page Views: 2,608

Income Per Day: $8

Estimated Value: $1,920

cobs.si is registered under .SI top-level domain. Please check other sites in .SI zone.

No name server records were found.

and is probably hosted by FREENET internet d.o.o.. See the full list of other websites hosted by FREENET internet d.o.o..

The highest website cobs.si position in Alexa rank database was 142938 and the lowest rank position was 999836. Current position of cobs.si in Alexa rank database is 549764.

Desktop speed score of cobs.si (75/100) is better than the results of 59.78% of other sites and shows that the page desktop performance can be improved.

Mobile usability score of cobs.si (57/100) is better than the results of 1.03% of other sites and means that the page is not mobile-friendly.

Mobile speed score of cobs.si (61/100) is better than the results of 57.04% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.

cobs.si Alexa Rank

The traffic rank is based on three months of aggregated historical traffic data from millions of Alexa Toolbar users and is a combined measure of page views and users.

cobs.si whois

WHOIS gives you the ability to lookup any generic domains to find out the registered domain holder. WHOIS database are provided for information purposes only. It allows the public to check whether a specific domain name is still available or not and to obtain information related to the registration records of existing domain names.

cobs.si server information

Servers Location

cobs.si desktop page speed rank

Last tested: 2019-04-02

Desktop Speed Medium

75/100

cobs.si Desktop Speed Test Quick Summary

priority - 10Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

https://cobs.si/images/latest-lightcurve_dark.png (expiration not specified)
https://cobs.si/images/latest_t.jpg (expiration not specified)
https://cobs.si/images/news/t_190328112601_1_900x600.jpg (expiration not specified)
https://cobs.si/images/news/t_20190102_mu69_nyt1.jpg (expiration not specified)
https://cobs.si/images/news/t_20190108-active_asteroid_gault.jpg (expiration not specified)
https://cobs.si/images/news/t_comet_C2018%20Y1_T20_H06_20_Dec_2018.jpg (expiration not specified)
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https://cobs.si/images/structure/dark/btn_analysis.png (expiration not specified)
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https://cobs.si/images/structure/dark/btn_links.png (expiration not specified)
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https://cobs.si/images/structure/dark/btn_news.png (expiration not specified)
https://cobs.si/images/structure/dark/btn_obs.png (expiration not specified)
https://cobs.si/images/structure/dark/btn_statistics.png (expiration not specified)
https://cobs.si/images/structure/dark/cobs_logo.png (expiration not specified)
https://cobs.si/scripts/DataTables/datatables.min.dark.css (expiration not specified)
https://cobs.si/scripts/jquery-latest.js (expiration not specified)
https://cobs.si/scripts/jquery.tablesorter.js (expiration not specified)
https://cobs.si/styles/cobs_style_dark.css (expiration not specified)
https://www.google-analytics.com/analytics.js (2 hours)

priority - 9Reduce server response time

In our test, your server responded in 1.1 seconds.

priority - 8Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 2 blocking script resources and 2 blocking CSS resources. This causes a delay in rendering your page.

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https://cobs.si/scripts/DataTables/datatables.min.dark.css

priority - 5Optimize images

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priority - 0Minify JavaScript

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priority - 0Minify CSS

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priority - 0Minify HTML

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cobs.si Desktop Resource Breakdown

Total Resources	26
Number of Hosts	4
Static Resources	21
JavaScript Resources	3
CSS Resources	2

cobs.si mobile page speed rank

Last tested: 2019-04-02

Mobile Speed Bad

61/100

cobs.si Mobile Speed Test Quick Summary

priority - 32Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 2 blocking script resources and 2 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

https://cobs.si/scripts/jquery-latest.js
https://cobs.si/scripts/jquery.tablesorter.js

Optimize CSS Delivery of the following:

https://cobs.si/styles/cobs_style_dark.css
https://cobs.si/scripts/DataTables/datatables.min.dark.css

priority - 16Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

priority - 13Reduce server response time

In our test, your server responded in 1 second.

priority - 5Optimize images

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 49.1KiB (37% reduction).

priority - 0Minify JavaScript

Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.

Minify JavaScript for the following resources to reduce their size by 3.3KiB (41% reduction).

Minifying https://cobs.si/scripts/jquery.tablesorter.js could save 3.3KiB (41% reduction) after compression.

priority - 0Minify CSS

Compacting CSS code can save many bytes of data and speed up download and parse times.

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Minifying https://cobs.si/styles/cobs_style_dark.css could save 797B (18% reduction) after compression.

priority - 0Minify HTML

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cobs.si Mobile Resource Breakdown

Total Resources	26
Number of Hosts	4
Static Resources	21
JavaScript Resources	3
CSS Resources	2

cobs.si mobile page usability

Last tested: 2019-04-02

Mobile Usability Bad

57/100

cobs.si Mobile Usability Test Quick Summary

priority - 40Use legible font sizes

The following text on your page renders in a way that may be difficult for some of your visitors to read. Use legible font sizes to provide a better user experience.

The following text fragments have a small font size. Increase the font size to make them more legible.

Register and 1 others render only 4 pixels tall (11 CSS pixels).

Current comet…ervable region and 6 others render only 6 pixels tall (16 CSS pixels).

Comet C/2018 Y1 (Iwamoto) renders only 5 pixels tall (12 CSS pixels).

Image of comet…s at ISO 3200. and 2 others render only 5 pixels tall (12 CSS pixels).

Comet Observat…atabase (COBS) and 1 others render only 5 pixels tall (13 CSS pixels).

Amateur astron…COBS database. and 7 others render only 5 pixels tall (13 CSS pixels).

Crni Vrh Observatory and 1 others render only 5 pixels tall (13 CSS pixels).

Comet…When visible and 1 others render only 5 pixels tall (13 CSS pixels).

V 123…PIL01 and 1 others render only 5 pixels tall (13 CSS pixels).

Min Solar Elongation: and 5 others render only 5 pixels tall (13 CSS pixels).

Apr. 02, 2019 and 4 others render only 5 pixels tall (12 CSS pixels).

MU69 appears a…orizons images and 4 others render only 6 pixels tall (16 CSS pixels).

The tiny world…become comets. and 4 others render only 5 pixels tall (13 CSS pixels).

Observations and 6 others render only 4 pixels tall (11 CSS pixels).
COBS Copyright © and 1 others render only 4 pixels tall (11 CSS pixels).

priority - 27Size content to viewport

The page content is too wide for the viewport, forcing the user to scroll horizontally. Size the page content to the viewport to provide a better user experience.

The page content is 1,280 CSS pixels wide, but the viewport is only 980 CSS pixels wide. The following elements fall outside the viewport:

The element <h1>COBS - Comet o…rvers database</h1> falls outside the viewport.
The element <a href="/register">Register</a> falls outside the viewport.
The element <a href="/login">Login</a> falls outside the viewport.
The element <a href="/observations?type=vis" class="tab">Observations</a> falls outside the viewport.
The element <a href="/analysis" class="tab">Analysis</a> falls outside the viewport.
The element <a href="/statistics" class="tab">Statistics</a> falls outside the viewport.
The element <a href="/help?page=data_policy" class="tab">Help</a> falls outside the viewport.
The element <a href="/links" class="tab">Links</a> falls outside the viewport.
The element <h2>Latest image</h2> falls outside the viewport.
The element <img src="images/latest_t.jpg"> falls outside the viewport.
The element <b>Comet C/2018 Y1 (Iwamoto)</b> falls outside the viewport.
The element <h2>Latest lightcurve</h2> falls outside the viewport.
The element <img src="images/latest-…curve_dark.png"> falls outside the viewport.
The element <p>Light-curve of…Apr 02, 2019).</p> falls outside the viewport.
The element <h3>Comet Observing Planner</h3> falls outside the viewport.
The element <td>Start session:</td> falls outside the viewport.
The element <select id="start_date2" name="start_date2">Select session…mical twilight</select> falls outside the viewport.
The element <td> falls outside the viewport.
The element <input id="start_date" type="text" name="start_date"> falls outside the viewport.
The element <td>End session:</td> falls outside the viewport.
The element <select id="end_date2" name="end_date2">Select session…Sun rise</select> falls outside the viewport.
The element <td> falls outside the viewport.
The element <input id="end_date" type="text" name="end_date"> falls outside the viewport.
The element <td>Limiting mag:</td> falls outside the viewport.
The element <input id="mag_lim" type="text" name="mag_lim"> falls outside the viewport.
The element <td>Min altitude:</td> falls outside the viewport.
The element <input id="min_altitude" type="text" name="min_altitude"> falls outside the viewport.
The element <td>Min Solar Elongation:</td> falls outside the viewport.
The element <input id="min_sol_elong" type="text" name="min_sol_elong"> falls outside the viewport.
The element <td>Min Lunar Elongation:</td> falls outside the viewport.
The element <input id="min_moon_elong" type="text" name="min_moon_elong"> falls outside the viewport.
The element <td></td> falls outside the viewport.
The element <td> falls outside the viewport.
The element <h3>Latest news</h3> falls outside the viewport.
The element <div class="news-date">Apr. 02, 2019</div> falls outside the viewport.
The element <h4>Comets & Aster…Jan & Feb 2019</h4> falls outside the viewport.
The element <p>During the 2-m…tail or trail.</p> falls outside the viewport.
The element <a href="show?id=596" class="more-link">more...</a> falls outside the viewport.
The element <div class="news-date">Mar. 29, 2019</div> falls outside the viewport.
The element <h4>Hubble watches…d coming apart</h4> falls outside the viewport.
The element <p>A small astero…g to new data.</p> falls outside the viewport.
The element <a href="show?id=595" class="more-link">more...</a> falls outside the viewport.
The element <div class="news-date">Jan. 15, 2019</div> falls outside the viewport.
The element <h4>COBS Maintenan…osted services</h4> falls outside the viewport.
The element <p>In the recent…a new server.</p> falls outside the viewport.
The element <a href="show?id=594" class="more-link">more...</a> falls outside the viewport.
The element <div class="news-date">Jan. 03, 2019</div> falls outside the viewport.
The element <h4>MU69 appears a…orizons images</h4> falls outside the viewport.
The element <p>The tiny world…become comets.</p> falls outside the viewport.
The element <a href="show?id=593" class="more-link">more...</a> falls outside the viewport.
The element <div class="news-date">Dec. 21, 2018</div> falls outside the viewport.
The element <h4>New Comet C/2018 Y1 (Iwamoto)</h4> falls outside the viewport.
The element <p>CBET 4588 & MP…Y1 (Iwamoto).</p> falls outside the viewport.
The element <a href="show?id=592" class="more-link">more...</a> falls outside the viewport.
The element <div id="footer-box">Home N…Links</div> falls outside the viewport.
The element <p class="footer-text">COBS Copyright…C BY-NC-SA 4.0</p> falls outside the viewport.

priority - 10Configure the viewport

Your page does not have a viewport specified. This causes mobile devices to render your page as it would appear on a desktop browser, scaling it down to fit on a mobile screen. Configure a viewport to allow your page to render properly on all devices.

priority - 6Size tap targets appropriately

Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.

The following tap targets are close to other nearby tap targets and may need additional spacing around them.

The tap target <a href="/register">Register</a> and 1 others are close to other tap targets.

The tap target <a href="/" class="tab">Home</a> is close to 1 other tap targets.

The tap target <a href="/news?page=1" class="tab">News</a> is close to 2 other tap targets.

The tap target <a href="/help?page=data_policy" class="tab">Help</a> is close to 2 other tap targets.
The tap target <a href="/links" class="tab">Links</a> is close to 1 other tap targets.
The tap target <input id="end_date" type="text" name="end_date"> and 4 others are close to other tap targets.
The tap target <a href="/">Home</a> and 6 others are close to other tap targets.
The tap target <a href="help?page=data_policy">COBS Copyright ©</a> and 2 others are close to other tap targets.

cobs.si HTML validation

Errors

Almost standards mode doctype. Expected “<!DOCTYPE html>”.

Line: 2 Column: 1 - 121
"... <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <head..."

Bad value “_empty” for attribute “target” on element “a”: Reserved keyword “empty” used.

Line: 107 Column: 13 - 56
"... <a href="images/latest.jpg" target="_empty"><img s..." Line: 140 Column: 11 - 176
"... <a href="analysis2?col=comet_id&id=1690&start_date=2017/09/01 00:00&end_date=2018/10/31 00:00&plot_type=0&perihelion=1&fit_curve=1&obs_type=3" target="_empty"><img src="ima..."

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

Line: 107 Column: 57 - 113
"...="_empty"><img src="images/latest_t.jpg" height="240" border="0" /></a> ..." Line: 140 Column: - 246
"......" Line: 269 Column: 33 - 108
"...w?id=574"><img src="images/news/t_C2018 N2 (ASASSN)_Q62_July_15_2018.jpg" width="100"></a> ..." Line: 284 Column: 33 - 96
"...w?id=573"><img src="images/news/t_180703105439_1_900x600.jpg" width="100"></a> ..." Line: 299 Column: 33 - 85
"...w?id=572"><img src="images/news/t_Oumuamua-16.jpg" width="100"></a> ..." Line: 314 Column: 33 - 85
"...w?id=571"><img src="images/news/t_PIA22357-16.jpg" width="100"></a> ..." Line: 329 Column: 33 - 96
"...w?id=570"><img src="images/news/t_180627160240_1_900x600.jpg" width="100"></a> ..."

End tag “strong” violates nesting rules.

Line: 127 Column: 166 - 174
"...icy</span></strong></a>. ..."

No “a” element in scope but a “a” end tag seen.

Line: 127 Column: 175 - 178
"...></strong></a>. Plea..."

Duplicate ID “first-page-content-right”.

Line: 134 Column: 2 - 36
"...ottom"> <div id="first-page-content-right"> <di..." Line: 182 Column: 3 - 37
"...ottom"> <div id="first-page-content-right"> <di..."

Duplicate ID “first-page-image-box”.

Line: 138 Column: 7 - 37
"...v> <div id="first-page-image-box"> ..."

Duplicate ID “first-page-image”.

Line: 139 Column: 9 - 35
"...> <div id="first-page-image"> ..."

Bad value “analysis2?col=comet_id&id=1690&start_date=2017/09/01 00:00&end_date=2018/10/31 00:00&plot_type=0&perihelion=1&fit_curve=1&obs_type=3” for attribute “href” on element “a”: Illegal character in query: space is not allowed.

Line: 140 Column: 11 - 176
"... <a href="analysis2?col=comet_id&id=1690&start_date=2017/09/01 00:00&end_date=2018/10/31 00:00&plot_type=0&perihelion=1&fit_curve=1&obs_type=3" target="_empty"><img src="ima..."

Duplicate ID “first-page-image-description”.

Line: 142 Column: 11 - 49
"... <div id="first-page-image-description"> ..."

Duplicate ID “first-page-bottom”.

Line: 181 Column: 2 - 29
"...ANER --> <div id="first-page-bottom"> <di..."

Duplicate ID “first-page-content”.

Line: 226 Column: 3 - 31
"...ES --> <div id="first-page-content"> <di..."

Duplicate ID “first-page-obs-list”.

Line: 231 Column: 3 - 32
"...="pad"> <div id="first-page-obs-list"> <pre>..."

Bad value “images/news/t_C2018 N2 (ASASSN)_Q62_July_15_2018.jpg” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.

Line: 269 Column: 33 - 108
"...w?id=574"><img src="images/news/t_C2018 N2 (ASASSN)_Q62_July_15_2018.jpg" width="100"></a> ..."

Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.

Line: 352 Column: - 21
"... <li><a href "/">Home</a></l..."

A slash was not immediately followed by “>”.

Line: 352 Column: - 23
"... <li><a href "/">Home</a></li>..."

Saw “"” when expecting an attribute name. Probable cause: “=” missing immediately before.

Line: 352 Column: - 23
"... <li><a href "/">Home</a></li>..."

Duplicate attribute “"”.

Line: 352 Column: - 24
"...<li><a href "/">Home</a></li> ..."

Attribute “"” not allowed on element “a” at this point.

Line: 352 Column: 13 - 24
"... <li><a href "/">Home</..."

End tag for “body” seen, but there were unclosed elements.

Line: 366 Column: 1 - 7
"...oter --> </body> </htm..."

Unclosed element “div”.

Line: 33 Column: 3 - 22
"... <body> <div id="container"> <!--..."

Warnings

The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.

Line: 107 Column: 57 - 113
"...="_empty"><img src="images/latest_t.jpg" height="240" border="0" /></a> ..." Line: 140 Column: - 246
"......"

The first occurrence of ID “first-page-content-right” was here.

Line: 99 Column: 2 - 36
"...MAGE --> <div id="first-page-content-right"> <di..." Line: 99 Column: 2 - 36
"...MAGE --> <div id="first-page-content-right"> <di..."

The first occurrence of ID “first-page-image-box” was here.

Line: 103 Column: 4 - 34
".../div> <div id="first-page-image-box"> ..."

The first occurrence of ID “first-page-image” was here.

Line: 105 Column: 11 - 37
"... <div id="first-page-image"> ..."

The first occurrence of ID “first-page-image-description” was here.

Line: 108 Column: 23 - 61
"... <div id="first-page-image-description"> ..."

The first occurrence of ID “first-page-bottom” was here.

Line: 132 Column: 5 - 32
"...div> <div id="first-page-bottom"> <di..."

The first occurrence of ID “first-page-content” was here.

Line: 151 Column: 14 - 42
"... <div id="first-page-content"> ..."

The first occurrence of ID “first-page-obs-list” was here.

Line: 156 Column: 5 - 34
"...pad"> <div id="first-page-obs-list"> <pre>..."

Attribute “href” without an explicit value seen. The attribute may be dropped by IE7.

Line: 352 Column: - 21
"... <li><a href "/">Home</a></l..."

Attribute “"” is not serializable as XML 1.0.

Line: 352 Column: 13 - 24
"... <li><a href "/">Home</..."

This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.

Line: 3 Column: 122 - 6
"...onal.dtd"> <head> <me..."

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cobs.si Ping

Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network. It measures the round-trip time for messages sent from the originating host to a destination computer that are echoed back to the source.

cobs.si TRACEROUTE

Traceroute is a computer network diagnostic tool for displaying the route (path) and measuring transit delays of packets across an Internet Protocol (IP) network. The history of the route is recorded as the round-trip times of the packets received from each successive host (remote node) in the route (path); the sum of the mean times in each hop is a measure of the total time spent to establish the connection. Traceroute proceeds unless all (three) sent packets are lost more than twice, then the connection is lost and the route cannot be evaluated.

COBS.SI COBS - Comet OBServation database

cobs.si Website Information

Advertisement

cobs.si Alexa Rank

cobs.si whois

cobs.si server information

Servers Location

cobs.si desktop page speed rank

cobs.si Desktop Speed Test Quick Summary

priority - 10Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

priority - 9Reduce server response time

In our test, your server responded in 1.1 seconds.

priority - 8Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 2 blocking script resources and 2 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

Optimize CSS Delivery of the following:

priority - 5Optimize images

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 49.1KiB (37% reduction).

priority - 0Minify JavaScript

Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.

Minify JavaScript for the following resources to reduce their size by 3.3KiB (41% reduction).

priority - 0Minify CSS

Compacting CSS code can save many bytes of data and speed up download and parse times.

Minify CSS for the following resources to reduce their size by 797B (18% reduction).

priority - 0Minify HTML

Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.

Minify HTML for the following resources to reduce their size by 655B (13% reduction).

cobs.si Desktop Resource Breakdown

cobs.si mobile page speed rank

cobs.si Mobile Speed Test Quick Summary

priority - 32Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 2 blocking script resources and 2 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

Optimize CSS Delivery of the following:

priority - 16Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

priority - 13Reduce server response time

In our test, your server responded in 1 second.

priority - 5Optimize images

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 49.1KiB (37% reduction).

priority - 0Minify JavaScript

Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.

Minify JavaScript for the following resources to reduce their size by 3.3KiB (41% reduction).

priority - 0Minify CSS

Compacting CSS code can save many bytes of data and speed up download and parse times.

Minify CSS for the following resources to reduce their size by 797B (18% reduction).

priority - 0Minify HTML

Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.

Minify HTML for the following resources to reduce their size by 655B (13% reduction).

cobs.si Mobile Resource Breakdown

cobs.si mobile page usability

cobs.si Mobile Usability Test Quick Summary

priority - 40Use legible font sizes

The following text on your page renders in a way that may be difficult for some of your visitors to read. Use legible font sizes to provide a better user experience.

The following text fragments have a small font size. Increase the font size to make them more legible.

priority - 27Size content to viewport

The page content is too wide for the viewport, forcing the user to scroll horizontally. Size the page content to the viewport to provide a better user experience.

The page content is 1,280 CSS pixels wide, but the viewport is only 980 CSS pixels wide. The following elements fall outside the viewport:

priority - 10Configure the viewport

Your page does not have a viewport specified. This causes mobile devices to render your page as it would appear on a desktop browser, scaling it down to fit on a mobile screen. Configure a viewport to allow your page to render properly on all devices.

priority - 6Size tap targets appropriately

Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.

The following tap targets are close to other nearby tap targets and may need additional spacing around them.

cobs.si HTML validation

Errors

Almost standards mode doctype. Expected “<!DOCTYPE html>”.

Bad value “_empty” for attribute “target” on element “a”: Reserved keyword “empty” used.

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

End tag “strong” violates nesting rules.

No “a” element in scope but a “a” end tag seen.

Duplicate ID “first-page-content-right”.

Duplicate ID “first-page-image-box”.

Duplicate ID “first-page-image”.

Bad value “analysis2?col=comet_id&id=1690&start_date=2017/09/01 00:00&end_date=2018/10/31 00:00&plot_type=0&perihelion=1&fit_curve=1&obs_type=3” for attribute “href” on element “a”: Illegal character in query: space is not allowed.

Duplicate ID “first-page-image-description”.