periodicvideos.com Website Information

Daily Unique Visits: 18,697

Daily Page Views: 112,182

Income Per Day: $224

Estimated Value: $161,280

This website is located in United Kingdom and is using following IP address 109.123.72.70. See the complete list of popular websites hosted in United Kingdom.

periodicvideos.com is registered under .COM top-level domain. Please check other sites in .COM zone.

Website periodicvideos.com is using the following name servers:

ultra101.uk2.net
ultra102.uk2.net

and is probably hosted by 20i Limited. See the full list of other websites hosted by 20i Limited.

The highest website periodicvideos.com position in Alexa rank database was 25878 and the lowest rank position was 999967. Current position of periodicvideos.com in Alexa rank database is 76707.

Desktop speed score of periodicvideos.com (54/100) is better than the results of 28.19% of other sites and shows that the page desktop performance can be improved.

Mobile usability score of periodicvideos.com (61/100) is better than the results of 5.47% of other sites and means that the page is not mobile-friendly.

Mobile speed score of periodicvideos.com (46/100) is better than the results of 27.13% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.

periodicvideos.com 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.

periodicvideos.com 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.

Domain Name: PERIODICVIDEOS.COM
Registry Domain ID: 1486026859_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.tucows.com
Registrar URL: http://www.tucows.com
Updated Date: 2021-05-27T10:36:40Z
Creation Date: 2008-06-03T20:39:18Z
Registry Expiry Date: 2022-06-03T20:39:18Z
Registrar: Tucows Domains Inc.
Registrar IANA ID: 69
Registrar Abuse Contact Email: domainabuse@tucows.com
Registrar Abuse Contact Phone: +1.4165350123
Domain Status: ok https://icann.org/epp#ok
Name Server: DNS1.UK2.NET
Name Server: DNS2.UK2.NET
Name Server: DNS3.UK2.NET
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2021-11-22T07:29:50Z

periodicvideos.com server information

Servers Location

periodicvideos.com desktop page speed rank

Last tested: 2015-11-21

Desktop Speed Bad

54/100

periodicvideos.com Desktop Speed Test Quick Summary

priority - 76Leverage browser caching

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https://cdn.syndication.twimg.com/widgets/timeline…e_codes=true&t=1609006 (60 seconds)
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http://www.google-analytics.com/ga.js (2 hours)

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

Your page has 1 blocking script resources. This causes a delay in rendering your page.

Use asynchronous versions of the following scripts:

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priority - 4Optimize images

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priority - 1Minify HTML

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periodicvideos.com Desktop Resource Breakdown

Total Resources	171
Number of Hosts	6
Static Resources	163
JavaScript Resources	4
CSS Resources	1

periodicvideos.com mobile page speed rank

Last tested: 2019-09-03

Mobile Speed Bad

46/100

periodicvideos.com Mobile Speed Test Quick Summary

priority - 110Leverage 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.

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https://cdn.syndication.twimg.com/timeline/profile…700&with_replies=false (5 minutes)
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priority - 14Optimize images

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priority - 3Enable compression

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priority - 0Minify HTML

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periodicvideos.com Mobile Resource Breakdown

Total Resources	191
Number of Hosts	7
Static Resources	184
JavaScript Resources	6
CSS Resources	1

periodicvideos.com mobile page usability

Last tested: 2019-09-03

Mobile Usability Bad

61/100

periodicvideos.com Mobile Usability Test Quick Summary

priority - 39Use 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.

PTOV is create…of Nottingham and 16 others render only 5 pixels tall (12 CSS pixels).

Tables chartin…bout each one. and 22 others render only 5 pixels tall (12 CSS pixels).

** and 1 others render only 7 pixels tall (18 CSS pixels).

** and 1 others render only 6 pixels tall (16 CSS pixels).

We've done all…r experiments. and 3 others render only 5 pixels tall (12 CSS pixels).

University of Nottingham and 6 others render only 5 pixels tall (12 CSS pixels).

by renders only 5 pixels tall (12 CSS pixels).

youtu.be/D5prOdWwzGg and 3 others render only 5 pixels tall (12 CSS pixels).

Periodic Videos Retweeted and 1 others render only 5 pixels tall (12 CSS pixels).

Nuclear Sciences and 1 others render only 5 pixels tall (12 CSS pixels).

@BradyHaran and 1 others render only 5 pixels tall (12 CSS pixels).

It's nearly lu…ool video from and 3 others render only 5 pixels tall (12 CSS pixels).

YouTube renders only 5 pixels tall (12 CSS pixels).

Aug 30, 2019 and 2 others render only 5 pixels tall (12 CSS pixels).

View on Twitter and 1 others render only 5 pixels tall (12 CSS pixels).

priority - 18Size 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="http://www.per…xtravideos.htm">Extra videos</a> and 8 others are close to other tap targets.

The tap target <a href="videos/safety_specs.htm">Safety Specs</a> and 10 others are close to other tap targets.

The tap target <a href="videos/001.htm"></a> and 117 others are close to other tap targets.

The tap target <a href="http://www.sci…/332/6033/1046">Science link</a> and 1 others are close to other tap targets.

The tap target <a href="https://twitte…bjectivity_Vid" class="PrettyLink pro…misable h-card">@Objectivity_Vid</a> and 1 others are close to other tap targets.

The tap target <a href="https://twitter.com/YouTube" class="Identity Ident…e-hover h-card">YouTube ‎@YouTube</a> and 2 others are close to other tap targets.

The tap target <a href="https://twitter.com/YouTube" class="Identity Ident…e-hover h-card">YouTube ‎@YouTube</a> is close to 1 other tap targets.

The tap target <a href="https://twitte…02608334016512" class="TweetAction Tw…art web-intent"></a> is close to 2 other tap targets.

The tap target <a href="#" class="TweetAction Tw…-showShareMenu"></a> is close to 2 other tap targets.

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.

periodicvideos.com HTML validation

Errors

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

Line: 2 Column: 1 - 39
"...<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html..."

Internal encoding declaration “iso-8859-1” disagrees with the actual encoding of the document (“utf-8”).

Line: 8 Column: 1 - 72
"...eed.xml"> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><link ..."

Bad value “text/html; charset=ISO-8859-1” for attribute “content” on element “meta”: “iso-8859-1” is not a preferred encoding name. The preferred label for this encoding is “windows-1252”.

Line: 8 Column: 1 - 72
"...eed.xml"> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><link ..."

The “align” attribute on the “div” element is obsolete. Use CSS instead.

Line: 76 Column: 1 - 20
"...> <body> <div align="center"> <ta..." Line: 79 Column: 9 - 28
"...> <td><div align="center"><a hre..." Line: 82 Column: 15 - 34
"... <td><div align="center"> ..." Line: 90 Column: 21 - 40
"... <td><div align="center"><a hre..." Line: 99 Column: 44 - 61
"...ight="96"><div align="left"><img s..." Line: 100 Column: 34 - 51
"...gn="left"><div align="left"><a hre..." Line: 102 Column: 34 - 51
"...gn="left"><div align="left"><a hre..." Line: 104 Column: 34 - 51
"...gn="left"><div align="left"><a hre..." Line: 108 Column: 34 - 51
"...gn="left"><div align="left"><a hre..." Line: 110 Column: 34 - 51
"...gn="left"><div align="left"><a hre..." Line: 122 Column: 30 - 49
"... width=""><div align="center"><stron..." Line: 239 Column: 13 - 32
"... <td><div align="center"><span ..." Line: 259 Column: 13 - 32
"... <td><div align="center"><span ..." Line: 299 Column: 13 - 31
"... <td><div align="right"><span ..." Line: 319 Column: 13 - 31
"... <td><div align="right"><span ..." Line: 367 Column: 27 - 45
"...dth="280"><div align="right"><img s..." Line: 368 Column: 27 - 44
"...dth="100"><div align="left"><a hre..." Line: 370 Column: 16 - 33
"... <td ><div align="left"><a hre..." Line: 373 Column: 29 - 46
"...ground=""><div align="left"><a hre..." Line: 375 Column: 29 - 46
"...ground=""><div align="left"><a hre..." Line: 389 Column: 27 - 45
"...dth="280"><div align="right"><a hre..." Line: 390 Column: 27 - 44
"...dth="100"><div align="left"><a hre..." Line: 392 Column: 15 - 32
"... <td><div align="left"><a hre..." Line: 394 Column: 15 - 32
"... <td><div align="left"><a hre..." Line: 396 Column: 27 - 44
"...dth="100"><div align="left"><a hre..." Line: 413 Column: 40 - 57
"...gcolor=""><div align="left"><img s..." Line: 416 Column: 17 - 34
"... <td><div align="left"><span ..." Line: 422 Column: 28 - 45
"...gcolor=""><div align="left"><img s..." Line: 425 Column: 28 - 45
"...gcolor=""><div align="left"> ..." Line: 432 Column: 28 - 45
"...gcolor=""><div align="left"><img s..." Line: 435 Column: 28 - 45
"...gcolor=""><div align="left"> ..." Line: 443 Column: 28 - 45
"...gcolor=""><div align="left"><img s..." Line: 446 Column: 17 - 34
"... <td><div align="left">Read o..." Line: 467 Column: 19 - 38
"...height=""><div align="center"><stron..."

The “width” attribute on the “table” element is obsolete. Use CSS instead.

Line: 77 Column: 3 - 84
"...enter"> <table width="800" bgcolor="#CCCCCC" border="0" cellspacing="10" cellpadding="10"> <tr..." Line: 80 Column: 7 - 70
"...br> <table width="800" background="images/graduated_background.jpg"> ..." Line: 83 Column: 13 - 76
"... <table width="800" background="images/graduated_background.jpg"> ..." Line: 88 Column: 13 - 47
"... <table width="790" align="center" > ..." Line: 92 Column: 13 - 76
"... <table width="800" background="images/graduated_background.jpg"> ..." Line: 97 Column: 13 - 91
"... <table width="762" align="center" background="images/graduated_background.jpg"> ..." Line: 115 Column: 13 - 76
"... <table width="800" background="images/graduated_background.jpg"> ..." Line: 120 Column: 13 - 76
"... <table width="800" background="images/graduated_background.jpg"> ..." Line: 125 Column: 13 - 76
"... <table width="800" background="images/graduated_background.jpg"> ..." Line: 135 Column: 9 - 84
"...> <td><table width="800" border="0" cellpadding="1" cellspacing="0" background=""> ..." Line: 359 Column: 24 - 87
"...="center"><table width="704" background="images/graduated_background.jpg"> ..." Line: 364 Column: 7 - 70
"...le> <table width="704" background="images/graduated_background.jpg"> ..." Line: 381 Column: 7 - 64
"...le> <table width="704" background="images/sun_background.jpg"> ..." Line: 386 Column: 7 - 70
"...le> <table width="704" background="images/graduated_background.jpg"> ..." Line: 401 Column: 7 - 64
"...le> <table width="704" background="images/sun_background.jpg"> ..." Line: 408 Column: 22 - 121
"...ght="192"><table width="704" border="0" align="center" cellpadding="6" background="images/sun_background.jpg"> ..." Line: 411 Column: 38 - 99
"...ign="top"><table width="388" border="0" cellspacing="2" cellpadding="2"> ..." Line: 455 Column: 38 - 72
"...ign="top"><table width="256" cellpadding="3"> ..."

The “bgcolor” attribute on the “table” element is obsolete. Use CSS instead.

Line: 77 Column: 3 - 84
"...enter"> <table width="800" bgcolor="#CCCCCC" border="0" cellspacing="10" cellpadding="10"> <tr..."

The “cellspacing” attribute on the “table” element is obsolete. Use CSS instead.

The “cellpadding” attribute on the “table” element is obsolete. Use CSS instead.

Line: 77 Column: 3 - 84
"...enter"> <table width="800" bgcolor="#CCCCCC" border="0" cellspacing="10" cellpadding="10"> <tr..." Line: 135 Column: 9 - 84
"...> <td><table width="800" border="0" cellpadding="1" cellspacing="0" background=""> ..." Line: 408 Column: 22 - 121
"...ght="192"><table width="704" border="0" align="center" cellpadding="6" background="images/sun_background.jpg"> ..." Line: 411 Column: 38 - 99
"...ign="top"><table width="388" border="0" cellspacing="2" cellpadding="2"> ..." Line: 450 Column: 11 - 73
"... <table border="0" align="left" cellpadding="4" cellspacing="4"> ..." Line: 455 Column: 38 - 72
"...ign="top"><table width="256" cellpadding="3"> ..."

The “border” attribute on the “table” element is obsolete. Use CSS instead.

The element “img” with the attribute “usemap” must not appear as a descendant of the “a” element.

Line: 79 Column: 49 - 125
"...ndex.htm"><img src="images/bannerv3.png" alt="PTOV" width="800" border=0 usemap="#Map"></a><b..."

Attribute “background” not allowed on element “table” at this point.

Line: 80 Column: 7 - 70
"...br> <table width="800" background="images/graduated_background.jpg"> ..." Line: 83 Column: 13 - 76
"... <table width="800" background="images/graduated_background.jpg"> ..." Line: 92 Column: 13 - 76
"... <table width="800" background="images/graduated_background.jpg"> ..." Line: 97 Column: 13 - 91
"... <table width="762" align="center" background="images/graduated_background.jpg"> ..." Line: 115 Column: 13 - 76
"... <table width="800" background="images/graduated_background.jpg"> ..." Line: 120 Column: 13 - 76
"... <table width="800" background="images/graduated_background.jpg"> ..." Line: 125 Column: 13 - 76
"... <table width="800" background="images/graduated_background.jpg"> ..." Line: 135 Column: 9 - 84
"...> <td><table width="800" border="0" cellpadding="1" cellspacing="0" background=""> ..." Line: 359 Column: 24 - 87
"...="center"><table width="704" background="images/graduated_background.jpg"> ..." Line: 364 Column: 7 - 70
"...le> <table width="704" background="images/graduated_background.jpg"> ..." Line: 381 Column: 7 - 64
"...le> <table width="704" background="images/sun_background.jpg"> ..." Line: 386 Column: 7 - 70
"...le> <table width="704" background="images/graduated_background.jpg"> ..." Line: 401 Column: 7 - 64
"...le> <table width="704" background="images/sun_background.jpg"> ..." Line: 408 Column: 22 - 121
"...ght="192"><table width="704" border="0" align="center" cellpadding="6" background="images/sun_background.jpg"> ..."

The “width” attribute on the “td” element is obsolete. Use CSS instead.

Line: 85 Column: 19 - 29
"... <tr> <td width=""><img s..." Line: 94 Column: 19 - 29
"... <tr> <td width=""><img s..." Line: 99 Column: 19 - 43
"... <tr> <td width="90" height="96"><div a..." Line: 117 Column: 19 - 29
"... <tr> <td width=""><img s..." Line: 122 Column: 19 - 29
"... <tr> <td width=""><div a..." Line: 127 Column: 19 - 29
"... <tr> <td width=""><img s..." Line: 361 Column: 11 - 21
"... <tr> <td width=""><img s..." Line: 366 Column: 13 - 26
"... <tr> <td width="280"> ..." Line: 367 Column: 38 - 26
"...nbsp;</td> <td width="280"><div a..." Line: 368 Column: 141 - 26
".../div></td> <td width="100"><div a..." Line: 378 Column: 22 - 26
".../div></td> <td width="100"> ..." Line: 383 Column: 13 - 23
"... <tr> <td width=""><img s..." Line: 388 Column: 13 - 26
"... <tr> <td width="280"> ..." Line: 389 Column: 38 - 26
"...nbsp;</td> <td width="280"><div a..." Line: 390 Column: 185 - 26
".../div></td> <td width="100"><div a..." Line: 396 Column: 73 - 26
".../div></td> <td width="100"><div a..." Line: 398 Column: 75 - 26
".../div></td> <td width="100"> ..." Line: 403 Column: 13 - 23
"... <tr> <td width=""><img s..." Line: 410 Column: 11 - 36
"... <tr> <td width="28" valign="top"> ..." Line: 411 Column: 48 - 37
"...nbsp;</td> <td width="375" valign="top"><table..." Line: 413 Column: 15 - 39
"... <tr> <td width="380" bgcolor=""><div a..." Line: 452 Column: 17 - 43
"... <tr> <td width="322" align="left"> ..." Line: 455 Column: 26 - 37
"...able></td> <td width="257" valign="top"><table..."

The “align” attribute on the “img” element is obsolete. Use CSS instead.

Line: 85 Column: 30 - 119
"... width=""><img src="images/elements/bluebar.jpg" alt="bluebar" width="800" height="4" align="right"></td> ..." Line: 94 Column: 30 - 119
"... width=""><img src="images/elements/bluebar.jpg" alt="bluebar" width="800" height="4" align="right"></td> ..." Line: 117 Column: 30 - 119
"... width=""><img src="images/elements/bluebar.jpg" alt="bluebar" width="800" height="4" align="right"></td> ..." Line: 127 Column: 30 - 119
"... width=""><img src="images/elements/bluebar.jpg" alt="bluebar" width="800" height="4" align="right"></td> ..." Line: 361 Column: 22 - 97
"... width=""><img src="images/elements/bluebar.jpg" align="right" width="650" height="4"></td> ..." Line: 383 Column: 24 - 106
"... width=""><img src="images/elements/bluebar.jpg" alt="" width="650" height="4" align="right"></td> ..." Line: 403 Column: 24 - 106
"... width=""><img src="images/elements/bluebar.jpg" alt="" width="650" height="4" align="right"></td> ..."

The “align” attribute on the “table” element is obsolete. Use CSS instead.

Line: 88 Column: 13 - 47
"... <table width="790" align="center" > ..." Line: 97 Column: 13 - 91
"... <table width="762" align="center" background="images/graduated_background.jpg"> ..." Line: 408 Column: 22 - 121
"...ght="192"><table width="704" border="0" align="center" cellpadding="6" background="images/sun_background.jpg"> ..." Line: 450 Column: 11 - 73
"... <table border="0" align="left" cellpadding="4" cellspacing="4"> ..."

The “height” attribute on the “td” element is obsolete. Use CSS instead.

Line: 99 Column: 19 - 43
"... <tr> <td width="90" height="96"><div a..." Line: 408 Column: 7 - 21
"...tr> <tr> <td height="192"><table..." Line: 467 Column: 7 - 18
"...tr> <tr> <td height=""><div a..."

The “align” attribute on the “td” element is obsolete. Use CSS instead.

Line: 100 Column: 150 - 33
".../div></td> <td align="left"><div a..." Line: 102 Column: 86 - 33
".../div></td> <td align="left"><div a..." Line: 104 Column: 84 - 33
".../div></td> <td align="left"><div a..." Line: 106 Column: 67 - 33
".../div></td> <td align="left"><a hre..." Line: 108 Column: 75 - 33
"...l</a></td> <td align="left"><div a..." Line: 110 Column: 80 - 33
".../div></td> <td align="left"><div a..." Line: 359 Column: 7 - 23
"...tr> <tr> <td align="center"><table..." Line: 452 Column: 17 - 43
"... <tr> <td width="322" align="left"> ..."

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

Line: 361 Column: 22 - 97
"... width=""><img src="images/elements/bluebar.jpg" align="right" width="650" height="4"></td> ..."

Attribute “background” not allowed on element “td” at this point.

Line: 373 Column: 22 - 28
".../div></td> <td background=""><div a..." Line: 375 Column: 69 - 28
".../div></td> <td background=""><div a..."

The “valign” attribute on the “td” element is obsolete. Use CSS instead.

Line: 410 Column: 11 - 36
"... <tr> <td width="28" valign="top"> ..." Line: 411 Column: 48 - 37
"...nbsp;</td> <td width="375" valign="top"><table..." Line: 455 Column: 26 - 37
"...able></td> <td width="257" valign="top"><table..."

The “bgcolor” attribute on the “td” element is obsolete. Use CSS instead.

Line: 413 Column: 15 - 39
"... <tr> <td width="380" bgcolor=""><div a..." Line: 422 Column: 15 - 27
"... <tr> <td bgcolor=""><div a..." Line: 425 Column: 15 - 27
"... <tr> <td bgcolor=""><div a..." Line: 432 Column: 15 - 27
"... <tr> <td bgcolor=""><div a..." Line: 435 Column: 15 - 27
"... <tr> <td bgcolor=""><div a..." Line: 443 Column: 15 - 27
"... <tr> <td bgcolor=""><div a..."

The “align” attribute on the “p” element is obsolete. Use CSS instead.

Line: 417 Column: 15 - 46
"... <p align="left" class="style23">We've ..." Line: 418 Column: 15 - 46
"... <p align="left" class="style23">Plus w..." Line: 419 Column: 15 - 46
"... <p align="left" class="style23">All th..."

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

Line: 428 Column: 215 - 218
".../strong>. </p> ..." Line: 439 Column: 15 - 18
"... </p> ..."

Element “area” is missing required attribute “alt”.

Line: 473 Column: 3 - 72
"...="Map"> <area shape="rect" coords="600,6,782,85" href="http://bit.ly/UONPTOV"> </map..."

Warnings

The “language” attribute on the “script” element is obsolete. You can safely omit it.

Line: 57 Column: 1 - 53
"... </style> <script language="JavaScript" type="text/JavaScript"> <!-- ..."

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

Line: 79 Column: 49 - 125
"...ndex.htm"><img src="images/bannerv3.png" alt="PTOV" width="800" border=0 usemap="#Map"></a><b..." Line: 100 Column: 95 - 186
"...rtyn.htm"><img src="images/extras/10anniversary_martyn.jpg" alt="" width="100" height="80" border="0"></a><b..." Line: 102 Column: 94 - 184
"...rady.htm"><img src="images/extras/10anniversary_brady.jpg" alt="" width="100" height="80" border="0"></a><b..." Line: 104 Column: 77 - 167
".../007.htm"><img src="images/picsofelements/07_nitrogen.jpg" alt="" width="100" height="80" border="0"></a><b..." Line: 106 Column: 72 - 152
"...tion.htm"><img src="images/extras/perpetual.jpg" alt="" width="100" height="80" border="0"></a><b..." Line: 108 Column: 90 - 169
"...tain.htm"><img src="images/extras/fountain.jpg" alt="" width="100" height="80" border="0"></a><b..." Line: 110 Column: 77 - 170
".../061.htm"><img src="images/picsofelements/061_promethium.jpg" alt="" width="100" height="80" border="0"></a><b..." Line: 137 Column: 38 - 137
".../001.htm"><img src="images/001.gif" alt="1 Hydrogen H" width="44" height="44" border="0" title="1 Hydrogen H"></a></..." Line: 154 Column: 38 - 135
".../002.htm"><img src="images/002.gif" alt="2 Helium He" width="44" height="44" border="0" title="2 Helium He"></a></..." Line: 157 Column: 38 - 137
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".../116.htm"><img src="images/116.gif" alt="116 Livermorium Lv" width="44" height="44" border="0" title="116 Livermorium Lv"></a></..." Line: 273 Column: 38 - 151
".../117.htm"><img src="images/117.gif" alt="117 Ununseptium Uus" width="44" height="44" border="0" title="117 Ununseptium Uus"></a></..." Line: 274 Column: 38 - 149
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periodicvideos.com 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.

periodicvideos.com 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.

PERIODICVIDEOS.COM The Periodic Table of Videos - University of Nottingham

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periodicvideos.com Desktop Speed Test Quick Summary

priority - 76Leverage 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 - 8Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 1 blocking script resources. This causes a delay in rendering your page.

Use asynchronous versions of the following scripts:

priority - 4Optimize images

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

Optimize the following images to reduce their size by 31.5KiB (28% reduction).

priority - 3Enable compression

Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.

Enable compression for the following resources to reduce their transfer size by 28.5KiB (81% reduction).

priority - 1Minify 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.

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periodicvideos.com Mobile Speed Test Quick Summary

priority - 110Leverage 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 - 14Optimize images

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

Optimize the following images to reduce their size by 139.1KiB (42% reduction).

priority - 3Enable compression

Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.

Enable compression for the following resources to reduce their transfer size by 27.6KiB (82% reduction).

priority - 0Minify HTML

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periodicvideos.com mobile page usability

periodicvideos.com Mobile Usability Test Quick Summary

priority - 39Use 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 - 18Size 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.

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.

periodicvideos.com HTML validation

Errors

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

Internal encoding declaration “iso-8859-1” disagrees with the actual encoding of the document (“utf-8”).

Bad value “text/html; charset=ISO-8859-1” for attribute “content” on element “meta”: “iso-8859-1” is not a preferred encoding name. The preferred label for this encoding is “windows-1252”.

The “align” attribute on the “div” element is obsolete. Use CSS instead.

The “width” attribute on the “table” element is obsolete. Use CSS instead.

The “bgcolor” attribute on the “table” element is obsolete. Use CSS instead.

The “cellspacing” attribute on the “table” element is obsolete. Use CSS instead.

The “cellpadding” attribute on the “table” element is obsolete. Use CSS instead.

The “border” attribute on the “table” element is obsolete. Use CSS instead.

The element “img” with the attribute “usemap” must not appear as a descendant of the “a” element.

Attribute “background” not allowed on element “table” at this point.

The “width” attribute on the “td” element is obsolete. Use CSS instead.

The “align” attribute on the “img” element is obsolete. Use CSS instead.

The “align” attribute on the “table” element is obsolete. Use CSS instead.

The “height” attribute on the “td” element is obsolete. Use CSS instead.

The “align” attribute on the “td” element is obsolete. Use CSS instead.

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

Attribute “background” not allowed on element “td” at this point.

The “valign” attribute on the “td” element is obsolete. Use CSS instead.

The “bgcolor” attribute on the “td” element is obsolete. Use CSS instead.

The “align” attribute on the “p” element is obsolete. Use CSS instead.

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

Element “area” is missing required attribute “alt”.

Warnings

The “language” attribute on the “script” element is obsolete. You can safely omit it.

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

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