| Science, health and medical journals, full text articles and books.

Mobile Usability



Mobile Speed



Last tested: 2017-08-27

Rescan Mobile Usability: 88/100 Mobile Usability Test Quick Overview

Size 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 <button id="ccs-mobileHamburgerButton" class="link"></button> is close to 1 other tap targets.
The tap target <a href="http://www.sci…ub/chemicaleng">Chemical Engineering</a> and 36 others are close to other tap targets.
The tap target <a href="http://www.sci…jrnlallbooks/a" class="letter track-usage">A</a> and 25 others are close to other tap targets.
The tap target <a href="http://www.sci…nlallbooks/0-9" class="other track-usage">0-9</a> is close to 1 other tap targets.
The tap target <a href="http://www.els…/sciencedirect" class="link-inherit">About ScienceDirect</a> and 5 others are close to other tap targets.
Size 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 428 CSS pixels wide, but the viewport is only 412 CSS pixels wide. The following elements fall outside the viewport:
The element <span class="svg-hamburger-closed"> falls outside the viewport.
The element <div class="extra extra-social"></div> falls outside the viewport.
The element <div class="els-footer">ElsevierAbout…B.V.RELX Group</div> falls outside the viewport. Mobile Speed: 75/100 Mobile Speed Test Quick Overview

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

Your page has 2 blocking CSS resources. This causes a delay in rendering your page.
Optimize CSS Delivery of the following:
Leverage 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:…99b3bf1d427fc5bd286.js (expiration not specified)…bba80e13f4b6fa0dd7c.js (expiration not specified)…08964746d4385002642.js (expiration not specified) (2.1 minutes)…rrors,TPAnalytics,LOGN (5 minutes)…ktop_bottom_retina.png (60 minutes)
Reduce server response time

Minify 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 10.4KiB (17% reduction).
Minifying http://sdfestaticassets-us-east-1.sciencedirectass…a0/javascripts/home.js could save 9.8KiB (17% reduction) after compression.
Minifying…08964746d4385002642.js could save 584B (14% reduction) after compression.
Optimize images

Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 1.5KiB (46% reduction).
Compressing…ktop_bottom_retina.png could save 1.5KiB (46% reduction). Mobile Resources

Total Resources32
Number of Hosts20
Static Resources14
JavaScript Resources14
CSS Resources2 Mobile Resource Breakdown